How are radio waves used on Earth?

Answers

Answer 1

Radio waves are a type of electromagnetic radiation with wavelengths in the electromagnetic spectrum longer than infrared light. Radio waves have frequencies as high as 300 GHz to as low as 3 kHz, though some definitions describe waves above 300 MHz or 3 GHz as microwaves, or include waves of any lower frequency. Have a good night!!

Answer 2

Explanation:

Radio wave is an electromagnetic wave. It travels with the speed of the light. It is the longest wavelength in the electromagnetic spectrum.

Radio wave is used in cellphone and radio communication.

Radio wave is generated by transmitters. It is received by using an antenna.

Radio wave is used in RADAR. RADAR is a detection system. It is used to determine the velocity of the object.

Related Questions

Homeowners will typically have their heaters set for about 140 degrees F. What is that temperature in C.

Answers

It would be 60 degrees Celsius:)

To convert 140 degrees Fahrenheit to Celsius, subtract 32 from the Fahrenheit temperature and multiply the result by 5/9, resulting in 60 degrees Celsius.

To convert a temperature from Fahrenheit to Celsius, we can use the formula: C = (F - 32) × 5/9, where F is the temperature in degrees Fahrenheit and C is the temperature in degrees Celsius. So, for a heater set to 140 degrees Fahrenheit, the conversion to Celsius would be:

C = (140 - 32) × 5/9

C = (108) × 5/9

C = 60

Therefore, 140 degrees Fahrenheit is equal to 60 degrees Celsius. This knowledge is essential when discussing the power needed to keep a house warm, as energy requirements are usually given in watts per degree Celsius (W/°C).

The sound intensity of street traffic is about 107 times greater than the threshold of hearing. what is the relative intensity of street traffic? use the formula

Answers

From the information, the sound intensity of street traffic is about 10^7 greater than the threshold of hearing.
Therefore; if the threshold of hearing is 1 then the street traffic is 10^7 times greater. Sound intensity is the sound power per unit area (W/m²), a sound energy quantity, the SI units are Watts/square meter. Sound intensity level in decibels is ten times the logarithm of the ratio of the sound intensity to the reference sound intensity of 1 pico watt/m²
Hence; the intensity level is LI = 10 × log (10 ^7)/1) dB
= 70 dB greater than the threshold of hearing at 0 dB
Thus the relative intensity of street traffic is 70 decibels.

Andesitic rocks have mineral compositions between those of ____ and basaltic rocks.

a. conglomerate

c. granitic

b. metamorphic

d. organic

Answers

The answer is C, granitic.

Answer:

The answer is Granitic rock

Explanation:

Granite is a light-colored igneous rock with pieces that are large enough to be visible with the naked eye. It is formed from the slow crystallization of magma below Earth's surface which we call as lava. Granite is composed mainly of quartz and feldspar with very small amounts of mica, amphiboles, and other minerals. If we talk about Andesitic rocks, they contain mineral compositions between those of granite and basaltic rocks.

Which is not a protection against electrical accidents?

a. fuse

b. conducting wire

c. insulation

d. grounded plug

Answers

b. conducting wire
Should be

Conducting wire cannot be a protection against electrical accidents since it is a metal conductor that acts as a carrier of electricity. Others, are safety devices used in electrical circuits like fuse.

1. Show how the alternative definition of power, found in your book, can be derived by substituting the definitions of work and speed into the standard definition of power, P = W / delta t.

2. A real spring does not oscillate forever. Instead, it eventually comes to a stop. Does this violate the Law of Conservation of Energy? Explain why or why not.

Answers

1) Star from the definition of power:

P = work/ time = W / Δt

We know that work is given by force times displacement:
W = F · Δd
Substituting in our formula:
P = F · Δd / Δt

But we know by definition that Δd / Δt = velocity, therefore we can write:
P = F · v
which is the alternative formula saying that Power is equal to Force times Velocity

2) No, it is not a violation of the Law of conservation of energy because as the spring slows down, the kinetic energy is transformed into potential energy and their sum stays constant.

If the strength of the magnetic field at A is 10 units, the strength of the magnetic field at B is

A)640 units
B)6.4 units
C)2.5 units
D)1.25 units

Answers

Strength or Intensity is the inverse-square of distance, thus I = 1c/d2, where c is a constant
So I(A) = 10, 10 = 1c/(2m)2 = c/4
10 = c/4, c = 40
Now distance of B is 4m, so strength of B:
[tex]I(B) = \frac{1c}{ {d}^{2} } = \frac{40}{ {4}^{2} } \\ I(B) = \frac{40}{16} = \frac{5}{2} = 2.5 \: units[/tex]
Answer: C) 2.5 units

2.5 units is the answer i just answered it right now aha,

is the following chemical equation balanced? 2Na + 2H 2 O 2NaOH + H 2

Answers

yes 2Na + 2H 2 O 2NaOH + H 2 is a balanced chemucal equation

Yes it is.

There are 2 Na atoms on each side,

there are 4 H atoms on each side (2H and H₂),

there are 2 O atoms on each side.

This means that the equation is even (not accounting for energy loss or anything like that).

20 points BRAINLIEST!!! ASAP ANSWER

Choose one piece of evidence. Explain, in your own words, how it supports the Big Bang Theory.
A. Redshift
B. CMB
C. Hydrogen and Helium
D. Less Evolved Distant Galaxies

Answers

The redshift shows that distant galaxies are moving away. The further away the galaxy, the bigger the redshift. More distant galaxies are moving away faster. Evidence that the universe is expanding and the start of the universe could have been from a single explosion. The Big Bang theory proposes that the universe began in a small space that was hot and dense and then expanded. A massive explosion expansion sent all matter outwards which caused the universe to expand.

How many atoms of each element are in the chemical formula P2O5?

2 phosphorus and 5 oxygen
5 phosphorus and 2 oxygen
1 phosphorus and 5 oxygen
2 phosphorus and 1 oxygen
the answer is the last one

Answers

2 phosphorus and 5 oxygen

Answer:

2 phosphorus and 5 oxygen

Explanation:

The chemical formula of the substance is:

[tex]P_2 O_5[/tex]

where each subscripts indicates the number of atoms of each element. We see that P (phosphorus) has a subscript '2' while O (oxigen) has a subscript '5', so the correct answer is

2 phosphorus and 5 oxygen

A 9.0 cm object is 3.0 cm from a lens, which has a focal length of –12.0 cm.

Answers

The question is missing, but I guess the problem is asking for the distance and the size of the image.

Let's find the distance first, by using the lens equation:
[tex] \frac{1}{f}= \frac{1}{d_o}+ \frac{1}{d_i} [/tex]
where f is the focal length, [tex]d_o[/tex] the distance of the object from the lens, [tex]d_i[/tex] the distance of the image from the lens. Using [tex]f=-12.0 cm[/tex] and [tex]d_o=3.0 cm[/tex], we find
[tex]- \frac{1}{12}= \frac{1}{3}+ \frac{1}{d_i} [/tex]
[tex]d_i=- \frac{12}{5}=-2.4 cm [/tex]
where the negative sign means the image is virtual, so located in front of the lens.

Now we can find the size of the image, using the relationship:
[tex] \frac{h_i}{h_o} =- \frac{d_i}{d_o} [/tex]
where [tex] h_i[/tex] and [tex] h_o[/tex] are the size of the image and of the object, respectively.
By using [tex] h_o=9.0 cm[/tex], we can find [tex] h_i[/tex], the size of the image:
[tex] h_i=-h_o \frac{d_i}{d_o}=-(9.0 cm) \frac{(-2.4 cm)}{3.0 cm}=7.2 cm [/tex]
where the positive sign means the image is upright.

The correct answers should be -2.4, 7.2, concave in that order

Which of the following are metalloid elements?

Check all that apply.

A. Boron (B)
B. Phosphorus (P)
C. Silicon (Si)
D. Tin (Sn)
E. Lead (Pb)

Answers

uuuuuuuuuuuuuuuuuiiiiiiiiiiiii

Boron and Silicon are metalloids

Cellular phones use _____?
A) radar waves
B) very high-frequency waves
C) very low-frequency waves
D) microwaves

Answers

Let's see: frequency of cellular phone waves (GSM phones) is (800-1900 MHz). If we look at the table of the electromagnetic spectrum, we can see that this range is contained within the frequencies of the microwaves, which include waves in the range 300 MHz-300 GHz.

So, summarizing, the correct answer is "microwaves".

3. D-Microwaves

1. C-electromagnetic spectrum

2. B-radio waves

^^(for those doing the three question physical science test)

Write the value 299,792,458 m/s in proper scientific notation to 4 significant figures. 2.998 × 108 m/s 2.997 × 108 m/s 2.998 × 106 m/s 2.997 × 106 m/s

Answers

First, let's find the correct exponent. We have 8 digits after the first digit (2), therefore the exponent will be 8. So, the correct answer must be among the first two options.
To understand which one is correct, let's have a look at the digits after 2. We have: 9979. If we want to round this number, it will be 998, because after the 7 we have a digit which is larger than 5, so 7 must be rounded to 8. Therefore, the correct number will be:
[tex]2.998\cdot 10^8 m/s[/tex]

Where in the motion is the magnitude of the net force on the object a maximum? where in the motion is the speed a maximum?

Answers

Assuming you are asking about some sort of oscillation, the magnitude of the net force is maximum where the acceleration of the object is the largest. The velocity of an object is maximum where the acceleration is zero.

Could someone help with these two answers please?

If the air inside a balloon exerts a force of 1.5 N on an area of 0.5 m², what is the pressure inside the balloon?
A. 0.5 N/m²
B. 1.5 N/m²
C. 2.5 N/m²
D. 3 N/m²

As your airplane takes off from an airstrip on the ground and rises 30,000 feet into
the sky, what happens to the air pressure on the outside of the airplane?
A. The air pressure decreases.
B. The air pressure increases.
C. The air pressure stays the same.
D. More information is needed.,

Answers

A) pressure = Force/ Area. Pressure = 1.5/0.5 = 3. B) Option A. The air pressure decreases. Since atmospheric pressure decreases with increasing altitude, as the plane soars higher and higher the pressure on the outside decreases since there are fewer air molecules -- the total weight of the air above a unit area becomes increasingly small. As we move higher up earth's surface, there are fewer air molecules than at lower levels; this explains why pressure decreases with increasing altitude.

Thunderstorms occur where warm, moist air has absorbed enough heat and moisture to be significantly __________ than the surrounding air.

Answers

Students should realize that if an object weighs more than an equal volume of water, it is more dense and will sink, and if it weighs less than an equal volume of water, it is less denseand will float. Remember that the density of water is about 1 g/cm3. Predict whether the following objects will sink or float.

The answer is less dense

as an object falls freely toward earth, the object's momentum is

1. decreses
2. inceases
3. remains the same,

Answers

The momentum of an object is the result of the mass of that object and the velocity by which it travels. So, since as an object falls towards the earth it's velocity increases, it's momentum would also increase at least until the object reaches its terminal velocity.

The object's momentum remains the same as it descends freely toward the earth.

So, option 3. is correct.

Define momentum.

Momentum is a measurable quantity that exists because an object is moving and has mass. The mass multiplied by the velocity equals momentum. If an item is stationary, its velocity is zero, and it has no momentum.

When an object descends toward Earth, it accelerates due to gravity, accumulating speed and momentum until the upward force of air resistance equals the downward force due to the object's weight under gravity, a point known as terminal velocity.

The law of conservation of momentum asserts that the overall momentum of objects that interact does not change in the absence of external forces such as friction.

So,

The object's momentum 3. remains the same as it descends freely toward the earth.

Find out more information about momentum here:

https://brainly.com/question/4956182?referrer=searchResults

As part of the photoelectric effect, which of these is responsible for the pixels in an image on a digital camera?

A. accumulated electrons that are absorbed by the image sensor.
B. accumulated electrons that are ejected by the image sensor.
C. accumulated photons that are ejected by the image sensor.
D. accumulated photons that are absorbed by the image sensor.,

Answers

The answer is D. Photons are individual units of light. In order for an image to exist, they need to be absorbed by something that can use them to create the picture. In old days, this was Silver Nitrate applied to film, but today it is the digital camera itself that does this. Electrons are something different entirely, so A and B are wrong, and C is wrong because the photons are not ejected by the image sensor.

Answer:

It's B) accumulated electrons that are ejected by the image sensor

On edge 2020

Explanation:

Which statement describes what most likely occurs when a compass is placed next to a simple circuit made from a battery, a light bulb, and a wire?

A. A magnetic field created by the compass increases the current in the electrical circuit.
B. A magnetic field created by the compass causes the light bulb to stop working.
C. A magnetic field created by the electric current places negative charges on the compass.
D. A magnetic field created by the electric current causes the compass needle to move.

Answers

When a compass is placed next to a simple circuit made from a
battery, a light bulb, and a wire, the magnetic field created by the
electric current in the wire causes the compass needle to move. (D)

In this circuit A magnetic field created by the electric current causes the compass needle to move. hence option D is correct.

Faraday's law of induction ?

Faraday's law states that "change in a magnetic field produces electric field in the circuit". It can also be stated as " when magnetic flux linked to a circuit changes, an electromotive force is induced in the circuit which is proportional to the rate of change of the flux".

If the wire shown in the circuit is non coated with insulated material. Current flowing through the circuit produces magnetic field around it. This produced magnetic field affects the magnetic field of middle of the compass. Created magnetic field of wire attract needle due to its magnetic field, as a result needle moves.

Hence option D is correct.

To know more about magnetic field click :

https://brainly.com/question/14848188

#SPJ2.

True or false, The golf club is swung in a northernly direction, and that is the direction the ball travels

Answers

Yes the answer is trye

Final answer:

The statement is false since merely swinging the golf club in a northern direction does not ensure that the ball will travel in that direction due to external influences like wind and gravity, much like an airplane can be blown off course.

Explanation:

The statement "The golf club is swung in a northernly direction, and that is the direction the ball travels" is false. In physics, particularly when discussing vectors and motions, the direction that an object is initially moved by a force (like a golf club hitting a ball) does not necessarily dictate that the object will continue to move in that initial direction. Various other forces and factors can influence the trajectory. For example, merely swinging the club in a northern direction does not account for factors such as wind, slope of the ground, spin of the ball, and gravity, all of which can alter the path of the golf ball.

Consider the analogy provided using an airplane's motion. An airplane heading north can be moved off that northward path by the wind, causing it to drift westward. Similarly, swinging the golf club in one direction does not guarantee the ball will follow that path precisely. Additionally, according to physics, when a magnet breaks, all pieces will indeed still have north and south poles, indicating that the physical direction is not the only factor determining the outcome—in both magnetism and ball trajectory.

I need help with 2 questions . Please help c:

1 . According to the nebular theory, the solar system formed from ?

accretion of protoplanets.
a large, thin cloud of dust and gas.
colliding planetesimals.
all of the above

2. Which of the following statements explains why the terrestrial planets are small and rocky instead of large and less dense like the gas giants?

The inner planets were exposed to much higher temperatures.
Ice-forming compounds vaporize at high temperatures.
Rock-forming materials can condense at high temperatures.
all of the above

Answers

a) According to the nebular theory, the Solar System formed from a huge gaseous nebula which at a certain point was perturbated. Atoms and molecules started colliding, forming planetesimals (a sort of big rocks). The planetesimals were attracted to each other by gravity, forming bigger warm almost spherical objects called protoplanets, which at the end cooled down forming planets.
Therefore the correct answer is "all of the above".

b) The planets closer to the Sun were (and still are) subject to higher temperatures, due to their close distance to the Sun. In these conditions, rocky materials undergo condensation, while iced gaseous materials undergo vaporization. In the outer parts of the Solar System temperatures are too low to allow these transformations.
The correct answer is again "all of the above".

Bob read data from the projectile motion lab graph shown and determined that the drop time was inversely proportional to the horizontal velocity. Which of the following statements is true?

Bob's conclusion was wrong because the x-axis scale is exaggerated.

Bob's conclusion was right because the data points were connected.

Bob's conclusion was wrong because the y-axis scale is exaggerated.

Bob's conclusion was right because the x-axis scale is exaggerated.,

Answers

When he determined that the drop time was inversely proportional to the horizontal velocity, the answer for it would be Bob's conclusion was right because the data points were connected. The connection of the x and y axis varied because it is inversely proportional.

How are important properties of Mercury, Venus, and Mars different from important properties of Earth?

Answers

Hi there,

There is one thing that is the most difference about other planets. Earth is a perfect condition for humans, animals, and other living things. Venus and Mars are not quite good for that. Venus has a very HOT surface, which makes it nearly impossible to be on. Mars on the other hand is very COLD, colder than earth because it is farther from the sun.

The closeness of measured values to an accepted value is the BLANK of the data ?

Answers

Answer: accuracy

Justification:

Any measure of a physical data is subject to errors. The errors can be of different kind.

The closer is a measure to the real or accepted value the more accurate the measure is.

For example, if you measure the length of a sheet of paper letter size and you know that the accepted value is 11 inches, then you can tell how accurate your measure is comparing with 11 inches.

Many times the measure is affected by the accuracy of the instrument used (the divisions), but it is also subject to human errors, and may be errors due to the method of measuring.

Which of the following represents the greatest energy transition from a higher energy level to a lower one?

emission of a blue photon of 450 nm

emission of a red photon of 770 nm

emission of a green photon of 550 nm

emission of a yellow photon of 590 nm

Answers

You need to use Planck's law:
E = h·υ = (h·c)/λ

Without making all the calculations, a fraction is bigger than another when the denominator is smaller. Therefore you need to find the smallest wavelength (λ) which is 450nm.

You could also be helped by colors: in order of decreasing energy, you have blue - green - yellow - red.

In any case, the correct answer is a).

Final answer:

The greatest energy transition from a higher energy level to a lower one is represented by the emission of a blue photon of 450 nm.

Explanation:

The greatest energy transition from a higher energy level to a lower one is represented by the emission of a blue photon of 450 nm. This is because the energy of a photon is inversely proportional to its wavelength. As the wavelength decreases, the energy increases. Since blue light has a shorter wavelength than red, green, and yellow light, it has the highest energy.

A rock is thrown upward with an initial velocity of 16 ft/s from an initial height of 5 ft. write a quadratic function equation that describes the height h at time t.

Answers

Final answer:

The quadratic function equation that describes the height of the rock is h = -16t^2 + 16t + 5.

Explanation:

To write a quadratic function equation that describes the height h at time t, we can use the kinematic equation for vertical motion: h = -16t^2 + 16t + 5. This equation represents the height of the rock as a function of time, taking into account the initial height, initial velocity, and acceleration due to gravity. The coefficient -16 in front of t^2 accounts for the downward acceleration of the rock.

An object has a kinetic energy of 275 j and a momentum of magnitude 25.0 kg · m/s. find the (a) speed and (b) mass of the object.

Answers

Kinetic energy = momentum^2 / 2 x mass
Mass = (momentum^2/ Kinetic energy) / 2

Mass = (25^2 / 275) / 2
Mass = 1.136 kg.

momentum = mass x velocity

velocity = mass / momentum
velocity = 1.136 / 25
velocity = 0.04544 m/s

Answer: The correct answers are 482.4 m/s and 21.96 kg.

Explanation:

The expression for the kinetic energy in terms of momentum of an object is as follows;

[tex]KE=\frac{p^{2} }{2m}[/tex]

Here, KE is the kinetic energy, p is the momentum and m is the mass of the object.

It is given in the problem that an object has a kinetic energy of 275 j and a momentum of magnitude 25.0 kg · m/s.

Calculate the mass of the object.

[tex]KE=\frac{p^{2} }{2m}[/tex]

Put p=25.0 kg · m/s and KE= 275 J.

[tex]m=\frac{25^{2} }{2(275)}[/tex]

[tex]m=1.14 kg[/tex]

Calculate the speed of the object.

[tex]KE=\frac{1}{2} mv^{2}[/tex]

Put m= 1.14 kg and KE= 275 J.

[tex]v=\sqrt{\frac{2(275)}{1.14} }[/tex]

v=21.96 m/s

Therefore, the speed of the object is 21.96 m/s and the mass of the object is 1.14 kg.

Jesse travels 3.0 meters east and then turns and travels 4.0 meters north. Which of the diagrams below illustrates his displacement?

Answers are in the diagram below.

Choose one.

And I will mark the right answer The Brainliest.

Answers

The second diagram. The arrow of the 3meters journey rests underneath the tail of the 4meters journey, and are both joined by the resultant 5meters vector joining the tail to the arrow

Answer: the Fourth diagram

Explanation: The fourth diagram shows movement from her origin with the arrows indicating her movement 3metres east, from where she turns north and walks 4 metres the arrows indicates that. The resultants 5meters indicates her return back to her starting point with the arrow pointing at the tail of the 3metres.

Know the characteristics of a solid, liquid, gas, plasma. (Definite shape/ volume?)

Answers

solids-are molecules that are together at all times( unless changed by a liquid or gas)

liquid-are molecules that move around freely in 1 space but can be changed to solid or gas

gas- molecules that move around freely and can be hot or cold depending

plasma- a material that goes to forming a cell or a liquid without any structual particles
There you go!

Whats number 4 ?????????

Answers

I believe c is the right answer.

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Chloe is painting on a stretched canvas that has an area of 108 square inches. The length of the canvas is 12 inches. The width of the canvas is how many inches. Chloe paints a 1-inch-wide blue border on the canvas. The area left for painting after painting the border is how many square inches. I WILL GIVE BRAINLIEST!:-) 3x+4y=-23 2y-x=-19 What is the solution (x,y) to the systems of equations above? What was the goal of Spanish settlements in Florida and New Mexico HELP PLEASE!!! Which figure shows a reflection of pre-image DEFG over the x-axis ? ( theres only an A B and C ) n the late fifteenth century, a major world power that established colonies in the era of Old Imperialism was . Their colonial activity was mainly limited to . 6 is 75% of what number A triangle with vertices at A(20, 30), B(10, 15), and C(5, 20) has been dilated with a center of dilation at the origin. The image of B, point B', has the coordinates (2, 3). What is the scale factor of the dilation? 110110 1515510 Create an equation to model a population of cells which starts with 10 cells and doubles in size every day. How many days will it take to reach 1,000,000 cells? can some one plz help me...Banks cannot provide amortization schedules to borrowers.A) true B) false, According to the Ninth Amendment to the Constitution, what do the "enumerated rights" in the Bill of Rights not do? Construct two tangents to circle O, at A and at B, where AB is a diameter. What relationship exists between the two tangents A neutral atom of which of the four element has the smallest radius If you could end violence against women in one setting, doing so in which of setting would reduce this type of violence the most? the workplace the home public places college campuses Suppose you start an annuity where you invent$2,000 at the beginning or each year and 4% interest is paid at the end of the year in which way were stalins communist state and hitlers fascist state similar To find the slope of a line using two points on the line, you can use the slope formula. Which formula will find the slope of a liney = rise/runy = run/rise Materials used in the float must be DURABLE. what kind of complement is the word in all caps A triangle has interior angles measuring 40 and 52.Which triangles are similar to this triangle?Select True or False for each triangle.Triangle True or False for eachTriangleTrueFalse1 triangle with interior angles measuring 52 and 92t or f2 triangle with interior angles measuring 40 and 92t or f3 triangle with interior angles measuring 52 and 88t or f4 triangle with interior angles measuring 40 and 88 t or f help me out due at 10 Which ending could not be dative? a.aeb.oc.isd.i