Physics College

a star with an original mass of 8 to 25 solar masses will ultimately become a ?
a) red giant
b)white dwarf
c) neutron star
d)main sequence star

Answers

Answer 1
The answer is C. Neutron star.

Related Questions

An electron has kinetic energy 3.00 ev. find its wavelength.

Answers

First we need to convert the electron's energy in Joule. Keeping in mind that
[tex]1 eV = 1.6 \cdot 10^{-19} J[/tex]
3 eV corresponds to
[tex]K=3 eV = 3 \cdot 1.6 \cdot 10^{-19}J=4.8 \cdot 10^{-19} J[/tex]

The kinetic energy of an electron is related to its momentum by the formula
[tex]K= \frac{p^2}{2m} [/tex]
where p is the electron's momentum, while m is its mass. Re-arranging the formula, we find
[tex]p= \sqrt{2Km}= \sqrt{2 (4.8 \cdot 10^{-19}J)(9.1 \cdot 10^{-31} kg)}=9.35 \cdot 10^{-25} kg m/s [/tex]

And then we can use De Broglie relationship to find its wavelength:
[tex]\lambda= \frac{h}{p}= \frac{6.6 \cdot 10^{-34}Js}{9.35 \cdot 10^{-25} kg m/s}=7.06 \cdot 10^{-10} m [/tex]

A metallic object is given a positive charge by the process of induction, as illustrated in Figure 18.8. (a) Does the mass of the object increase, decrease, or remain the same? Why? (b) What happens to the mass of the object if it is given a negative charge by induction? Explain.

Answers

a. In the process of induction, metal objects are positive because electrons are pushed out of the object to the earth. The mass of the object decreases by an amount equal to the mass of the electrons leaving the metal object.

b. During the induction process, electrons are drawn from the earth to the object, so that the metal object becomes negative. The mass of the object increases by an amount equal to the mass of "excess" electrons dragged onto the object.

In a circuit of two lamps in parallel there is 5 v across one lamp. what is the voltage across the other lamp? answer in units of v.

Answers

The voltage across the other lamp is also 5 V.
In fact, when two resistances are connected in parallel, they are connected to the same points of the circuit. This also means that the potential difference across the two sides of the resistors is the same, therefore the voltage across the two lamps connected in parallel is 5 V for both.

The change in velocity that occurs within an interval of time is known as _____ .


average acceleration


acceleration


instantaneous acceleration


deceleration

Answers

The change in velocity that occurs within an interval of time is known as ACCELERATION.
Acceleration is the rate of change of velocity with time. It is a vector quantity. The rate of change of velocity can be positive or negative. The positive change of velocity is called acceleration while the negative change in velocity is called deceleration.  

The change in velocity that occurs within an interval of time
is known as average acceleration.

What determines the range of spectral lines produced during electron transition? the higher energy level to which the electron jumps the lower energy level to which the electron returns the total number of energy levels the electron can jump to the number of electrons under electronic transition at the same time

Answers

Answer: the total number of energy levels the electron can jump to.


Explanation:

The spectral lines (which may be emission or absorption lines) correspond to to the loss (release) or gain (absortion) of energy of the electrons when they jump between energy levels.

So, the greater the number of energy levels the greater the number of spectral lines.




Answer:

the total number of energy levels the electron can jump to.

Explanation:

Which color in the visible spectrum has the highest frequency?

Answers

Which color in the visible spectrum has the highest frequency?

The color in the visible spectrum that has the highest frequency is the violet. 

Violet waves have the most energy of the visible spectrum.

Remember:  c=fλ

Therefore:  f=c/λ

Here c is the speed of light in a vacuum.

So:

As wavelength decreases, frequency increases and, as E=hf, where h is constant (Planck's constant), so does the energy that the waves carry. Waves with a short wavelength have the most energy.

Red waves have a relatively long wavelength (in the 700 nm range), and violet waves are much shorter - roughly half that.

Because violet waves have the shortest wavelength of the visible light spectrum, they carry the most energy.

Violet is the color in the visible spectrum that has the highest frequency. (option b)

The visible spectrum consists of various colors that we can see with our eyes, ranging from red to violet. Each color corresponds to a specific wavelength of light. Wavelength is the distance between consecutive peaks (or troughs) of a wave. The frequency of a wave, on the other hand, refers to how many waves pass a particular point in space per unit of time.

The relationship between frequency (f), wavelength (λ), and the speed of light (c) can be described by the equation:

c = f × λ

where c is the speed of light in a vacuum (approximately 3 × 10^8 meters per second), f is the frequency, and λ is the wavelength.

As per this equation, the higher the frequency of light, the shorter the wavelength. Conversely, the lower the frequency, the longer the wavelength.

Hence the correct option is (b),

To know more about frequency here

https://brainly.com/question/31833676

#SPJ6

Complete Question:

Which color in the visible spectrum has the highest frequency?

a) Blue

b) Violet

c) Green

d) Red

 i will give u BRAINILIEST!!!!

A major consequence of ozone depletion is that 

       
A. certain parts of the earth will become over-vegetated.   
B. solar energy will become ineffective.   
C. more harmful UV rays will reach the earth's surface.  
 D. acid rain will increase.

Answers

There you can give her brainiest

A major consequence of ozone depletion is C. more harmful UV rays will reach the earth's surface due to ozone depletion. The correct option is C.

A major consequence of ozone depletion is that more harmful ultraviolet (UV) rays will reach the Earth's surface (Option C). Ozone depletion in the stratosphere allows increased penetration of UV-B and UV-A radiation, which can have adverse effects on human health, ecosystems, and the environment. Excessive UV exposure can lead to skin cancer, cataracts, and other health issues in humans.

It can also harm marine life, crops, and forests, disrupting ecosystems and food chains. Stratospheric ozone depletion does not directly cause over-vegetation (Option A), render solar energy ineffective (Option B), or increase acid rain (Option D). Addressing ozone depletion through international agreements like the Montreal Protocol is crucial to mitigate its harmful impacts on the planet and its inhabitants.

To know more about ozone depletion

https://brainly.com/question/33333816

#SPJ6

A muon is traveling at 0.995
c. what is its momentum? (the mass of such a muon at rest in the laboratory is 207 times the electron mass.)

Answers

The momentum of a relativistic particle is given by
[tex]p= \gamma m_0 v[/tex]
where
[tex]\gamma= \frac{1}{ \sqrt{1- \frac{v^2}{c^2} } } [/tex] is the relativistic factor
[tex]m_0[/tex] is the rest mass of the particle
v is the speed particle

The rest mass of the muon is 207 times the rest mass of the electron:
[tex]m_0 = 207 m_e = 207 \cdot 9.1 \cdot 10^{-31} kg=1.88 \cdot 10^{-28} kg[/tex]
The muon is moving at speed 0.995 c, therefore its velocity is
[tex]v=0.995 c=0.995 \cdot 2.998 \cdot 10^8 m/s =2.983 \cdot 10^8 m/s[/tex]
And the relativistic factor is
[tex]\gamma = \frac{1}{ \sqrt{1- (\frac{0.995 c}{c})^2 } } =10.01[/tex]

If we plug these numbers into the first equation, we find the muon momentum:
[tex]p= \gamma m_0 v=(10.01)(1.88 \cdot 10^{-28} kg)(2.983 \cdot 10^8 m/s)=[/tex]
[tex]=5.61 \cdot 10^{-19} kgm/s[/tex]

A teacher pushed a 98 newton desk across a floor for a distance of 5 meter he exerted a horizontal force of 20 newton for four seconds

Answers

Missing question: "how much work is done by the teacher?" (found on internet)

Solution:
The work done to move the desk across the floor is equal to
[tex]W=Fd[/tex]
where F is the horizontal force applied to move the desk, and d is the distance covered by the desk. If we use F=20 N and d=5 m, we find the work done:
[tex]W=Fd=(20 N)(5 m)=100 J[/tex]
Final answer:

The work done by the teacher in pushing the desk is calculated by multiplying the force exerted (20 newtons) by the distance covered (5 meters), which gives a total work done of 100 joules.

Explanation:

To calculate the amount of work done in moving an object, we use the formula: Work = Force x Distance.

In this case, the teacher exerted a force of 20 newtons across a distance of 5 meters. Therefore the work is calculated as: 20N x 5m = 100 joules.

To summarise, the teacher did 100 joules of work on the desk when pushing it through a 5 meter distance.

Learn more about Work done here:

https://brainly.com/question/35917320

#SPJ3

The complete question is here:

A teacher pushed a 98 newton desk across a floor for a distance of 5 meters. She exerted a horizontal force

of 20 newtons. How much work was done?

A car moves along a curved road of diameter 2 km. If the maximum velocity for safe driving on this path is 30 m/s, at what angle has the road been banked? (Ignore friction.)

Answers

The maximum velocity in a banked road, ignoring friction, is given by;

v = Sqrt (Rg tan ∅), where R = Radius of the curved road = 2*1000/2 = 1000 m, g = gravitational acceleration = 9.81 m/s^2, ∅ = Angle of bank.

Substituting;
30 m/s = Sqrt (1000*9.81*tan∅)
30^2 = 1000*9.81*tan∅
tan ∅ = (30^2)/(1000*9.81) = 0.0917
∅ = tan^-1(0.0917) = 5.24°

Therefore, the road has been banked at 5.24°.

Final answer:

To calculate the bank angle for a curve of diameter 2 km (radius 1 km) to be driven at 30 m/s without relying on friction, the physics concepts of centripetal force and gravitational force component due to the bank angle are applied.

Explanation:

In this scenario, the safety of driving on a curved road relies on the balance between the inward centripetal force required for the car to maintain its curved path and the normal force exerted by the road on the car. The normal force acts perpendicular to the road surface and has both horizontal and vertical components.

To find the angle at which the road is banked, we first calculate the centripetal force required for the car to negotiate the curve safely. This force is given by the formula [tex]\( F_c = \frac{mv^2}{r} \)[/tex], where [tex]\( m \)[/tex] is the mass of the car, [tex]\( v \)[/tex]is the velocity of the car, and [tex]\( r \)[/tex] is the radius of the curve. Given that the diameter of the road is 2 km, the radius[tex]\( r \)[/tex]is half of this distance.

Once we determine the centripetal force, we recognize that it must be balanced by the horizontal component of the normal force. The vertical component of the normal force counteracts gravity. Therefore, the angle at which the road is banked can be found by taking the inverse tangent of the ratio of the centripetal force to the gravitational force.

By calculating this angle, we can determine the angle at which the road must be banked to safely accommodate the car's velocity while moving along the curved path. In this case, the calculated angle is approximately [tex]\( 5.22^\circ \).[/tex]

Which of the following states that all matter tends to "warp" space in its vicinity and that objects react to this warping by changing their paths?

Newton's Universal Law of Gravitation

Einstein's General Relativity

Einstein's Special Relativity

Newton's First Law of Motion

Answers

it will be Einstein's General Relativity

Answer:

Einstein's General Relativity

Explanation:

The above statement is an interpretation of Einsteins General  theory of relativity. The theory of  relativity states that  all matter tends to wrap space in its vicinity and objects respond to this warp by changing their paths. The matter has mass and because of this mass the space in its vicinity is warped. The time space according to Einsteins is a streched fabric.

Advise how volta specifically can patent its its (first in the world and novel) clean energy engine.

Answers

Volta specifically can patent in clean energy engine novel in as it has to fulfill the three criteria.
1. It should be useful.
2. It should be unique or new in the market.
3. It should be non-obvious which is easily recognizable. 
It is easy to understand. The three qualities are being possessed by novel VOLTa as the concept is very new and it will be very beneficial for the world or public.

Final answer:

In advising Volta on patenting a clean energy engine, it is essential to consider thermodynamic laws, which preclude the possibility of engines that produce more energy than used or have 100% efficiency, and acknowledge the efficiency limits set by the Carnot cycle.

Explanation:

When considering a patent for a novel clean energy engine, it is important to understand fundamental principles of thermodynamics, which would challenge the claim of an engine running by burning hydrogen that allegedly produces more energy than it uses. Such a system would violate the second law of thermodynamics, as it implies perpetual motion or over-unity efficiency, which is physically impossible because it would create energy from nothing. Likewise, claiming a 100% efficient motor also breaks this immutable law of physics, as all systems produce waste heat due to inefficiencies.

A typical gasoline car engine cannot achieve 100% efficiency due to these losses through heat, friction, and sound, among other factors. The theoretical efficiency ceiling for a gasoline engine is dictated by the Carnot cycle, which is typically less than 45% for a combustion engine. In terms of adopting clean energy technologies like geothermal power and vehicles running on electric or hydrogen fuel cells, it is important to approach these with a balanced view, recognizing both the environmental benefits and the practical limitations or challenges of these technologies.

True or false: convection is the term used to describe how molecules move within a fluid such as a liquid or gas.

Answers

it is true
about the rerms2

Choose the statement about nuclear fusion that is always correct?
A) Very little energy is released in fusion processes.
B) Due to its instability, 56Fe readily undergoes fusion.
C) Nuclear fusion is an energetically favorable process for lighter atoms.
D) In fusion reactions, a proton and an electron combine to create a neutron.


EDIT: THE ANSWER IS (C)

Answers

The correct answer is C.
Nuclear fusion is an energetically favorable process for lighter atoms.
 The proportion of hydrogen which is converted to energy in nuclear fusion is 0.68 percent or 0.7 percent.
Nuclear fusion produces energy which is from matter and nuclear fusion produces matter from energy.
The nuclear energy which splits large atom into small ones and then gives out energy.
Some matter is being lost and being converted to energy by Einstein's Δm×C².
Nuclear energy fusion makes larger elements and takes smaller elements.
For fusion to occur then energy must be converted to mass.

yeah it is c
 Nuclear fusion is an energetically favorable process for lighter atoms. 

In the absence of air resistance and friction, what will happen to the velocity of an object going at 20 m/s E?

Answers

In the absence of any other forces, the object will continue to move at 20 m/s E.

In fact, Newton's second law states that the resultant of the forces acting on an object is equal to the product between the mass and the acceleration of the object:
[tex]\sum F = ma[/tex]
therefore, if there are no forces acting on the object, the term on the left is zero, and the acceleration of the object is zero as well. This means that the object will continue its motion with constant speed, and in the same direction.

A person on earth would weigh a lot more on the sun due to increased ________________. gravity mass atoms energy

Answers

The correct answer is: gravity.

The complete sentence is:
"A person on earth would weigh a lot more on the sun due to increased gravity"

In fact, the weight of a person is given by
[tex]F=mg[/tex]
where m is the mass of the person, while g is the gravitational acceleration. While the mass m of the person does not change moving from Earth to the Sun, the gravitational acceleration g does depend on the mass of the planet/star. In fact:
[tex]g= \frac{GM}{r^2} [/tex]
where G is the gravitational constant, M is the mass of the planet/star, r is its radius. Due to the fact that the mass of the sun is huge compared to the Earth's mass, the gravitational acceleration at the Sun's surface is much more than the gravitational acceleration at Earth's surface, so a person would weigh much more on the Sun than on Earth.

(by comparison, the value of g at the Sun's surface is approximately 28 times the value of g at Earth's surface).

A straight 1.0 m long wire is carrying a current. the wire is placed perpendicular to a magnetic field of strength 0.20 t. if the wire experiences a force of 0.60 n, what is the current in the wire?

Answers

A current carrying wire placed perpendicular to a magnetic field experiences a force equal to
[tex]F=ILB[/tex]
where
I is the current in the wire
L is the wire length
B is the intensity of the magnetic field

In our problem, the length of the wire is L=1.0 m, the magnetic field strength is B=0.20 T and the force exerted on the wire is F=0.60 N. If we re-arrange the equation and we plug these numbers into it, we find the current in the wire:
[tex]I= \frac{F}{LB}= \frac{0.60 N}{(1.0 m)(0.20 T)}=3 A [/tex]

When a bow an arrow is fired, how does the size of the force of the bow on the arrow compare of the arrow on the bow

Answers

Stated by Newton's 2nd Law of Motion, the arrow will exert an equal force on the bow as the bow exerts on the arrow. So if the bow applies 2 Newtons of force on the arrow, the arrow will apply 2 Newtons of force back on the bow.

Final answer:

The force of the bow on the arrow is equal and opposite to the force of the arrow on the bow, complying with Newton's Third Law. The energy to shoot an arrow comes from converting kinetic energy to potential energy, and then back to kinetic energy upon release. Projectile range is affected by the angle of release and external factors like wind.

Explanation:

When a bow and arrow is fired, the size of the force of the bow on the arrow is equal to the size of the force of the arrow on the bow. This is due to Newton's Third Law of Motion, which states that for every action, there is an equal and opposite reaction. In terms of archery, when the archer releases the string, the potential energy stored in the bow is transferred to the arrow, propelling it forward. At the same time, the bow experiences an equal and opposite force.

Energy and Projectile Motion

The energy it takes to shoot an arrow involves converting kinetic energy from pulling the string into potential energy stored in the string. Upon release, this potential energy turns back into kinetic energy, which determines the speed and range of the arrow. For a fixed initial speed, the range of a projectile like an arrow is determined by the angle of release. The smaller angle is often preferable due to minimal air resistance and other factors like wind, while a larger angle may be useful to shoot over obstacles or reach longer distances, as with a football punter using a higher trajectory to maximize hang time.

According to the Big Bang theory, _____. A)Earth's moon was created from a collision with MarsB) the universe was created from a cosmic explosion C) our solar system is shrinking and will eventually collapse into the sun D) in about 5 billion years, the sun will swell and engulf the inner planets

Answers

B. the universe was created from a cosmic explosion

The answer is B. the universe was created from a cosmic explosion.


It is called the Big Bang Theory, but actually there was no REAL explosion. What happened was the universe expanded from a really dense and hot superforce. There were no stars, atoms, and the like. This point was called "singularity,"- a mass that contained all the mass, and the space-time of the universe.

A hot water heater is operated by using solar power. if the solar collector has an area of 5.3 m2 , and the power delivered by sunlight is 995 w/m2 , how long will it take to increase the temperature of 1 m3 of water from 20 ◦c to 65 ◦c? the specific heat of water is 4186 j/kg · ◦ c and the density of water is 1000 kg/m3 . answer in units of h.

Answers

Heat absorbed by the solar collector = Area*Irradiance = 5.3*995 = 5273.5 W

Heat Q in joules absorbed in t hours = Heat used to heat water. That is,

5273.5*t = mCΔT; where mass = volume*density = 1*1000 = 1000 kg

Therefore;
5273.5t = 1000*4186*(65-20) = 188370000
t = 188370000/5273.5 = 35720.11 seconds = 35720.11/(60*60) hours ≈ 9.92 hours.

It will take approximately 9.92 hours.

What set of simple machines would be needed to create the complex machine shown here?

Answers

gears, screw, wheel, and axel


PLEEEEEEASE PPLEASE HELP MEM!?!?!?!!??
Astrologers use the stars to predict the future. This could be considered (2 points) Select one: a. science because we can study the stars. b. science because it is based on beliefs. c. pseudoscience because it involves beliefs not facts. d. pseudoscience because it is backed by scientific studies.

Answers

Answer:

I would say the answer is C

Explanation:

Because I don't believe that stars can predict the future (correct me if I'm wrong)

Answer:

C

Explanation:

I did the test

The humber bridge in england has the world's longest single span, 1410 m . calculate the change in length of the steel deck of the span when the temperature increases from -3.0 ∘c to 18.5 ∘c.

Answers

Applicable linear expansion equation:
ΔL = αΔTL
In which
ΔL = change in length, α = Linear expansion coefficient of steel, ΔT = change in temperature, L = original length

Therefore,
ΔL = 12*10^-6*(18.5-(-3))*1410 = 0.36378 m

Final answer:

The steel deck of the Humber Bridge would expand by 0.362 meters (362 millimeters)

Explanation:

To calculate the change in length of the steel deck of the Humber Bridge when the temperature increases you need to use the linear thermal expansion formula: [tex]\(\Delta L = \alpha L_0 \Delta T\),[/tex] where [tex]\(\Delta L\)[/tex]is the change in length, \(\alpha\) is the coefficient of thermal expansion for steel [tex](\12 x 10^-6 /\u2103\), \(L_0\)[/tex] is the original length of the steel structure, and \(\Delta T\) is the change in temperature.

First, find the change in temperature: [tex]\(18.5 \u2103 - (-3.0 \u2103) = 21.5 \u2103\).[/tex]

Then, use the given length of the Humber Bridge span (1410 meters) and plug these values into the equation:

[tex]\(\Delta L = (12 x 10^{-6}/\u2103)(1410 m)(21.5 \u2103)\)[/tex]

By doing the calculation:

[tex]\(\Delta L = 0.362 m\)[/tex]

The steel deck of the Humber Bridge would expand by 0.362 meters (or 362 millimeters).

Why do clothes often cling together after tumbling in a clothes dryer? 1. the dryer heat caused some of the fabrics to melt together. 2. gravitational force 3. air pressure 4. the clothes are electrically neutral. 5. electrical force?

Answers

i think it is 3 or 2 hope i helped

A mechanical high-speed bat is flying along a path perpendicular to a wall. it emits a sound with a frequency f0 . the night is clear and the air is still. let the speed of sound waves in the still air be vs . the bat hears a sound wave reflected from the wall with a frequency fnew . from this information one can determine the speed vbat at which the bat is flying. install a detector at the wall. 0 bat f v what is the detected frequency? 1. f1 = vs + vbat vs f0 2. f1 = vs vs − vbat f0 3. f1 = vs vs + vbat f0 4. f1 = vs + vbat vs − vbat f0 5. f1 = 2 vs vs − vbat f0 6. f1 = vs − vbat vs f0 7. f1 = vs − vbat vs + vbat f0 8. f1 = f0 9. f1 = 2 vs vs + vbat f0

Answers

Final answer:

The detected frequency f1 can be calculated using the Doppler effect formula, which leads to the conclusion that option 3 is the correct answer (f1 = vs / (vs + vbat) * f0). This equation allows to determine the actual speed of the bat.

Explanation:

This question can be addressed using the Doppler effect principle, which describes how the frequency of sound changes for an observer moving in relation to a sound source.

Given that the bat is moving perpendicular to the wall with the speed vbat and since the night is clear and air is still (meaning no additional obstructions in the sound path), the detected frequency f1 can be calculated using the Doppler effect formula:

f1 = vs / (vs + vbat) * f0.

Therefore, option 3 is the correct answer. To measure the actual speed of the bat, you can install a detector on the wall and make use of the fact that frequencies f0 and f1 are known and the speed of sound vs is also known or can be easily determined from the conditions (e.g., air temperature).

Learn more about Doppler Effect here:

https://brainly.com/question/33454469

#SPJ12

Final answer:

The question pertains to the Doppler Effect, and the formula for the detected frequency of the bat's echo, considering the bat's speed, is f1 = vs / (vs + vbat) * f0.

Explanation:

The question deals with the concept of the Doppler Effect in physics. This effect relates to the change in frequency or wavelength of a wave in relation to an observer who is moving relative to the wave source. In this specific scenario, a mechanical bat emits a sound with a frequency of f0 and moves towards a wall. The sound wave reflects off the wall and returns to the bat. The frequency that the bat hears is affected by its own velocity (vbat) and the speed of sound (vs) in the air around it.

Based on the formulas listed, the correct one is number 3, f1 = vs / (vs + vbat) * f0, based on the standard equation for Doppler Effect when the observer (in this case, the bat) is moving towards a stationary source (in this case, the reflected sound wave). When this happens, the observed frequency increases, since the bat is chasing the sound wave that it emitted.

Learn more about Doppler Effect here:

https://brainly.com/question/15318474

#SPJ11

Extend your thinking: household appliances are usually connected in a parallel circuit. why do you think it might be a problem if too many appliances are turned on at once? (hint: current in a wire also produces heat.)

Answers

The equivalent resistance of several devices connected in parallel is given by
[tex] \frac{1}{R_{eq}} = \frac{1}{R_1}+ \frac{1}{R_2}+...+ \frac{1}{R_n} [/tex]
where [tex]R_i[/tex] are the resistances of the various devices. We can see that every time we add a new device in parallel, the term [tex] \frac{1}{R_{eq}} [/tex] increases, therefore the equivalent resistance of the circuit [tex]R_{eq}[/tex] decreases.

But Ohm's law:
[tex]I= \frac{V}{R_{eq}}[/tex]
tells us that if the equivalent resistance decreases, the total current in the circuit increases. The power dissipated through the circuit (and so, the heat produced) depends on the square of the current:
[tex]P=I^2 R[/tex]
therefore if there are too many devices connected in parallel, this can be a problem because there could be too much power dissipated (and too much heat) through the circuit.

There might be a problem of a lot of power being dissipated if too many

appliances are turned on at once.

We can infer from Ohm's law that as resistance decreases, the total current increases.

I= V/R

The power dissipated through the circuit is directly proportional to the square

of the current.

P= I²R

We can therefore state that the power dissipated via heat will be much when

too many appliances are turned on at once.

Read more about Electricity here https://brainly.com/question/25144822

An electron has a kinetic energy of 3.00 ev. find its wavelength. (b) what if? a photon has energy 3.00 ev. find its wavelength.

Answers

(a) The electron kinetic energy is
[tex]K=3.00 eV[/tex]
which can be converted into Joule by keeping in mind that
[tex]1 eV=1.6 \cdot 10^{-19}eV[/tex]
So that we find
[tex]K=3.00 eV \cdot 1.6 \cdot 10^{-19} eV/J =4.8 \cdot 10^{-19}J[/tex]

The kinetic energy of the electron is related to its momentum p by:
[tex]K= \frac{p^2}{2m} [/tex]
where m is the electron mass. Re-arranging the equation, we find
[tex]p= \sqrt{ 2Km}= \sqrt{ 2 ( 4.8 \cdot 10^{-19} J)(9.1 \cdot 10^{-31} kg) } =9.35 \cdot 10^{-25} kgm/s [/tex]

And now we can use De Broglie's relationship to find its wavelength:
[tex]\lambda= \frac{h}{p}= \frac{6.6 \cdot 10^{-34} Js}{9.35 \cdot 10^{-25} kg m/s} =7.06 \cdot 10^{-10}m [/tex]
where h is the Planck constant.


(b) By using the same procedure of part (a), we can convert the photon energy into Joules:
[tex]E=3.00 eV \cdot 1.6 \cdot 10^{-19} eV/J =4.8 \cdot 10^{-19}J[/tex]

The energy of a photon is related to its frequency f by:
[tex]E=hf[/tex]
where h is the Planck constant. Re-arranging the equation, we find
[tex]f= \frac{E}{h}= \frac{4.8 \cdot 10^{-19} J}{6.6 \cdot 10^{-34}Js} =7.27 \cdot 10^{14}Hz [/tex]

And now we can use the relationship between frequency f, speed of light c and wavelength [tex]\lambda[/tex] of a photon, to find its wavelength:
[tex]\lambda= \frac{c}{f}= \frac{3 \cdot 10^8 m/s}{7.27 \cdot 10^{14} Hz} =4.13 \cdot 10^{-7} m [/tex]

The wavelength of the electron from the given kinetic energy is [tex]7.1 \times 10^{-10} \ m[/tex].

The wavelength of the electron from the given photon energy is [tex]4.13 \times 10^{-7} \ m[/tex].

Momentum of the electron

The momentum of the electron is calculated as follows;

[tex]P = \sqrt{2Km} \\\\P = \sqrt{2 \times (3 \times 1.6 \times 10^{-19} \times 9.11 \times 10^{-31} } = 9.35 \times 10^{-25} \ kgm/s[/tex]

Wave of the electron

The wavelength of the electron is determined by using  De Broglie's equation.

[tex]\lambda = \frac{h}{p} \\\\\lambda = \frac{6.6 \times 10^{-34} }{9.35 \times 10^{-25}} = 7.1 \times 10^{-10} \ m[/tex]

Wavelength of the electron from the given photon energy

E = hf

[tex]E = \frac{hc}{\lambda} \\\\\lambda = \frac{hc}{E} \\\\\lambda = \frac{6.6 \times 10^{-34} \times 3\times 10^8}{3\times 1.6 \times 10^{-19}} \\\\\lambda = 4.13 \times 10^{-7} \ m[/tex]

Learn more about wavelength of photons here: https://brainly.com/question/10728818

A load absorbs s = 28 kva at a leading power factor of pf = 0.79. use this information to calculate the average (p) and reactive (q) power for the load. enter comma separated numerical answers with three significant figures.

Answers

Power factor (PF) = Average power (kW)/Apparent power (kVA)

From the information given;
0.79 = Average power/28
Average power = 28*0.79 = 22.12 kW

Reactive power (kVAR) = Sqrt (Apparent power^2 - Average power^2) = 9Sqrt (28^2 - 22.12^2) = 17.17 kVAR

Answers: 22.12 kW, 17.17 kVAR

Matter's resistance to a change in motion is called _____ and is directly proportional to the mass of an object. For an object to change its state of motion, a force must be applied to it.

A.Velocity
B.inertia
C.distance
D.area

Answers

The correct answer is B (Inertia)

We define inertia as the resistance to change of the state of motion. That is, a body tends to remain in its state of motion or rests unless an external for acts on it. The quantity depends on the mass of the body. If the body is heavy, it requires a large force to overcome the inertia. 

What would the potential of a standard hydrogen electrode (s.h.e.) be under the given conditions? [h+]=0.70 mph2=2.4 atmt=298 k?

Answers

Constant = 8.314JK⁻¹mol⁻¹
T is for temperature which is 298K
Faraday constant value is 96500C/mol
n is the number of electrons which are transferred in the reaction.
Ecell = E₀cell - RT/nFiN [cathode]/[anode]
Ecell = E₀cell - RT/nF In [PH₂]/[H⁺]²
Ecell = 0.00-8.314 JK⁻¹ mol⁻¹ × 298k/ 2× 96500C/mol In [2.4atm]/ 0.70]²
Ecell = 0.00 - 0.0129 In (2.59)
Ecell = 0.00 - 0.0129 × 0.951
Ecell = -0.0122V
∴Ecell is = -o.0122v
Other Questions
Where were the Pilgrims originally bound? A. Virginia B. Pennsylvania C. Massachusetts D. New York What does the metaphor of the "endless sea of sound" accomplish? If the height of your he sailboat is 3 centimeters, what is the height in meters, of the actual boat Why did Shakespeare's plays appeal so much to the audiences of his time? A.They captured the struggle toward democratic principles to empower the common man. B.They illustrated the use of medicine and science to find cures for mental and physical illness. C.They demonstrated the belief that brute force was more important than character and that science was more powerful than the supernatural. D.They incorporated power struggles within and between monarchies, superstitious beliefs, and the power of supernatural elements. What is the y-intercept of the equation 5x - 6y = 18? A.-6 B. -3C .5 D. 18 A recent poll taken by the movie theatre industry shows that 28% of the population attends a movie in a theater at least once a month. A sample of 300 people shows that only 12% of people attends a movie in a theater at least once a month. To determine whether this sample supports the population proportion of 0.28, a simulation of 100 trials is run, each with a sample size of 200 and a point estimate of 0.12. The minimum sample proportion from the simulation is 0.10, and the maximum sample proportion from the simulation is 0.28. What is the margin of error of the population proportion using half the range? In Great Britain, which city boomed to become an industrial center between 1717 and 1911? Birmingham Manchester Roubaix Ruhr Gender, age, heredity, race, and the environment are all examples of What is the equation of the line that passes through the points (12, 8) and (17, 16)?A.-17=-8/5(x-16)B.-16=8/5(x-17)C.+16=-4/5(x+10)D.y+16=8/5(x+17) Toxicodendron rydbergii is the scientific name for western poison ivy. Toxicodendron radicans is the scientific name for eastern poison ivy. Which of the following statements are true? Based on conductivity values, classify the compounds in each set of solutions as molecular, ionic, or acids. what is the level of dissociation (complete, varying, or none) of each set Phytic acid and oxalic acid ________ the absorption of dietary iron. In the space below, identify an islamic state, mongol khanate, city-state, and decentralized form of feudalism that developed a new form of governance. provide an explanation of what makes it unique. According to mcclelland, the need for affiliation is most closely related to the need to When choosing a person for the civil service, the Tang dynasty considered this the most important factor. A. position in society B. age C. wealth D. merit can anyone help me please The use of Chemicals such as formaldehyde and asbestos has decreased because they have been can someone please help ill try to add the picture What type of chicken is a castrated male with tender meat, smooth skin,andhigh fat content? giving away all these points to the lucky person who can explain how to get the answer (Law of Cosines) !!!