The lengthening of a transmitted signal's wavelength and/or a decrease in its frequency, which indicates that the object is moving away from the observer, is called the

Answers

Answer 1

Both the effects (lengthening of the transmitted signal's wavelength and decrease in its frequency) indicates that the object is moving away from the observer, and this phenomenon is called Doppler effect.

In fact, when the object is moving away from the observer, the relative distance between two consecutive crests of the wave emitted by the object increases to the observer eyes, since he's moving away. This means that the wavelength appears larger, and since the frequency is inversely proportional to the wavelength, the frequency appears smaller.

Answer 2

The red shift... Hope it helps!

Related Questions

If a rock weighing 2,200 N is dropped from a height of 15 m, what is its KE just before it hits the ground? Remember, weight is measured in newtons (N), and is equal to mass times gravity.

A. 0 J
B. 2,224 J
C. 147 J
D. 33,000 J

Answers

This is a question conservation of energy. That is;
Potential energy = Kinetic energy

mgh = 1/2*mv^2 = KE

Therefore,
KE = mgh = (2200/9.81)*9.81*15 = 2200*15 = 33000 J

The correct answer is D.

A rod made from insulating material carries a net charge, while a copper sphere is neutral. The rod and the sphere do not touch. Is it possible for the rod and the sphere to (a) attract one another and (b) repel one another? Explain.

Answers

As the charged insulating rod approaches the sphere (not in contact), free electrons in the sphere move. If the rod is negatively charged, free electrons move to the side of the sphere opposite the side with the rod. If the rod is positively charged, the free electron moves to the side of the sphere with the rod. In either case, the region of the sphere near the rod acquires a charge with the sign opposite to that on the rod.

a. Since opposedly charged objects always attract each other, the rod and ball always experience mutual attractive forces.

b. Since the side of the sphere near the bar always has the opposite charge to the charge of the rod, the rod and the sphere always attract each other. They do not repel each other.

Answer:

Sphere R must be negative and Sphere S must be positive or neutral.

Explanation:

Castle Learning. Also the Rod diagram shows electrons in it and we know like charges repel and opposites attract, so the rod must repel Sphere R because it is negative and attract to Sphere S because it is the opposite.

Most objects emit infrared energy. how do humans recognize this? A.their skin senses it as warmth B. Their vision becomes clearer C. They experience goose bumps on their skin D. They see light emitted from the object

Answers

A. Their skin senses it's warmth.

Answer: The correct answer is "their skin senses it as warmth".

Explanation:

Electromagnetic wave: the direction of electric field and magnetic field are perpendicular to the direction to the propagation of the wave. It travels with the speed of the light.

For example, X-rays, gamma rays, infrared rays and visible region.

Infrared radiation: The range of the wavelength is from 700 nm to 1 mm. It is longer than the visible light. It is a part of the electromagnetic spectrum.

The infrared radiations cannot be seen by naked eyes of human. It can be felt by the human being. They can sense it as heat.

It is given in the problem that most objects emit infrared energy. Human can feel this infrared radiation. Their skin senses it as warmth.

What condition is necessary for a moving object to produce a shockwave?

Answers

When an object passes through the air, it creates a series of pressure waves in front of it and behind it, similar to the bow and stern waves created by a boat. These waves travel at the speed of sound.

What are (a) the kinetic energy, (b) the rest energy, and (c) the total energy of a 1.50 g particle with a speed of 0.600 c ?

Answers

kinetic energy = 1/2 m v^2 = 1/2 x1.5 x10^-3 x 0.36

A circuit has a current of 1.2 A. If the voltage decreases to one third of its original amount while the resistance remains constant, what will be the resulting current?

Answers

When resistance is constant, current is proportional to voltage. When 1/3 the voltage is applied, 1/3 the current will result.

(1/3)*(1.2 A) = 0.4 A

The resulting current will be 0.4 A.

Which change occurs when an atom undergoes decay?

Answers

When an atom undergoes decay its nucleus becomes unstable because it does not have a balance of neurons and protons. This means the atoms try to find a confirmation in which it is stable. In doing so, it is possible that the atom changes its element, and it frees a huge amount of energy in order to balance itself. This is the base of radioactivity.

Reflection is the bouncing of light rays off of a surface. Which situation is NOT an example of reflection?
A) looking at yourself in a mirror
B) focusing light through a camera lens
C) seeing an image of yourself in a still lake
D) looking at your teacher at the front of the class

Answers

B) Focusing light through a camera lens.

In each of the other options, light rays bouncing off a surface produce an image.

The answer is B, Focusing light through a camera lens.s

You have just completed a wonderful meal of pasta and crusty bread followed by a huge piece of chocolate cake. This carbohydrate-rich meal has lead to the release of large amounts of sugar into your bloodstream. What is necessary to address the change in blood sugar level?

Answers

Your pancreas must secrete a large amount of insulin, to get all that glucose into your cells. If it just stays in your blood for hours and hours, it 'cooks' your kidneys and your eyes, among other internal organs, and they fail sooner than they should.

This is a description of Diabetes ... the production of not enough insulin (Type-2) or none at all (Type-1).

There's no cure. The treatment is:

-- be reasonable about the carbs you take in;

-- get regular exercise;

-- if you still have high levels of glucose in your blood, you'll have to start regular medication (pills) or insulin injections.

The magnetic flux through each loop of a 75-loop coil is given by (8.8t−0.51t3)×10−2t⋅m2, where the time t is in seconds.

Answers

To determine the emf as the function of time emf of the coil which is induced is
E = -NdФ/dt
= -(75) d/dt ((8.8-0.5Lt³) × 10⁻²)
=-(75) (8.8-0.51(3+2)) ₓ 10⁻²
=-6.6 + 1.15t²) V
The value of t = 1.1s and t= 3.15
t = 1.1s, where induced emf is
E = (-6.6 +1.15 (1.1)²)
=-5.23V
At t= 3.1s, where induced emf is
E = (-6.6 +1.15(3.1)²)
=4.45V

Final answer:

The magnetic flux through each loop of a coil can be calculated using the given expression. The magnetic moment of the coil can be found by multiplying the current and the area of the loop. Faraday's law states that a changing magnetic flux induces an electromotive force in a circuit.

Explanation:

The magnetic flux through each loop of a 75-loop coil can be calculated using the expression: (8.8t−0.51t³)×10−²t⋅m², where t represents time in seconds. The magnetic flux is a measure of the magnetic field passing through a surface. It can also be calculated using the product of the magnetic field strength and the area of the loop.

The magnetic moment of the coil can be found using the formula μ = IA, where I is the current and A is the area of the loop. Substituting the given values, we find that the magnetic moment equals 2.5 × 10⁻⁶ A·m².

Faraday's law states that a changing magnetic flux through a loop induces an electromotive force (emf) in the circuit. Therefore, if the current through the coil varies with time, the magnetic flux will change accordingly and an emf will be induced in the circuit.

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What is the energy q released in the first step of the thorium-232 decay chain? the atomic mass of 232 90th is 232.038054 u and the atomic mass of 228 88ra is 228.0301069 u. express your answer numerically in megaelectron volts?

Answers

Answer: The energy released in the given nuclear reaction is 4.98 MeV.

Explanation:

The equation for the alpha decay of Th-232 nucleus follows:

[tex]_{90}^{232}\textrm{Th}\rightarrow _{88}^{228}\textrm{Ra}+_{2}^{4}\textrm{He}[/tex]

We are given:

Mass of [tex]_{90}^{232}\textrm{Th}[/tex] = 232.038054 u

Mass of [tex]_{88}^{228}\textrm{Ra}[/tex] = 228.0301069 u

Mass of [tex]_{2}^{4}\textrm{He}[/tex] = 4.002602 u

To calculate the mass defect, we use the equation:

[tex]\Delta m=\text{Mass of reactants}-\text{Mass of products}[/tex]

Putting values in above equation, we get:

[tex]\Delta m=(m_{Th})-(m_{Ra}+m_{He})\\\\\Delta m=(232.038054)-(228.0301069+4.002602)=0.0053451u[/tex]

To calculate the energy released, we use the equation:

[tex]E=\Delta mc^2\\E=(0.0053451u)\times c^2[/tex]

[tex]E=(0.0053451u)\times (931.5MeV)[/tex] (Conversion factor: [tex]1u=931.5MeV/c^2[/tex] )

[tex]E=4.98MeV[/tex]

Hence, the energy released in the given nuclear reaction is 4.98 MeV.

Its C Disposal of radioactive waste is a major concern in nuclear power production. Which method of disposal is least dangerous?

Answers

Least dangerous i could be wrong but feeding it to racoons.

In the visible spectrum, red light has the lowest frequency and violet light has the highest. List the following colors in order of increasing energy. green blue yellow orange A) blue, green, yellow, orange B) orange, yellow, green, blue C) yellow, orange, blue, green D) green, blue, orange,w

Answers

The correct answer is:
B) orange, yellow, green, blue

the energy of the photons of light is directly proportional to the frequency of the light. This means that the lower the frequency, the lower the energy, and the higher the frequency, the greater the energy.

Therefore, the order in increasing energy is exactly the same as the order in increasing frequency, which is:

orange, yellow, green, blue

The answer is b !!!!!!

A battery is the power source for what type of current?
A. AC
B.BC
C.DC
D.All types of current

Answers

A battery is the power source for DC. (C)

You COULD use a battery to get AC, but you'd need some electronics,
to take the DC from the battery and use it to generate AC.

Answer:

C. DC

Explanation:

A battery is the power source for DC type of current. A battery is a source of constant potential difference that produces a constant current unlike in AC source where the voltage and hence the current changes its polarity continuously.Hence, the current produced by battery is direct current and not Alternating current.

What factors determine power

Answers

The factors that are used to determine power are: Voltage, Current, and the Power Factor.

When x-rays of wavelength 0.312 nm are directed at a crystalline sample, the smallest bragg angle for a certain family of reflecting planes is found to be 28.5°. within the sample, the atoms lie on a simple cubic lattice, a 2-dimensional view of which is shown to the right. assuming that the constructive interference observed is due to the pair of diagonal planes indicated by the two dashed lines, find the distance a between neighboring atoms?

Answers

The equation for bragg's law is nλ=2dsinθ. The smallest angle is when n=1 and we are told the angle is 28.5. d in our equation is the distance between atoms. So:

(1)(0.312*10^-9)=2dsin(28.5)

Solving for d we get

d=3.26925*10^-10m

An oscillating block - spring system has a mechanical energy of 1.10 j, and amplitude of 11.0 cm, and a maximum speed of 1.7 m/s. find the spring constant.

Answers

The total mechanical energy of the block-spring system is given by the sum of the potential energy and the kinetic energy of the block:
[tex]E=U+K= \frac{1}{2}kx^2 + \frac{1}{2}mv^2 [/tex]
where
k is the spring constant
x is the elongation/compression of the spring
m is the mass of the block
v is the speed of the block

At the point of maximum displacement of the spring, the velocity of the block is zero: v=0, so the kinetic energy is zero and the mechanical energy is just potential energy of the spring:
[tex]E= \frac{1}{2}kA^2 [/tex] (1)
where we used x=A, the amplitude (which is the maximum displacement of the spring).
Since we know
A = 11.0 cm= 0.11 m
E = 1.10 J
We can re-arrange (1) to find the spring constant:
[tex]k= \frac{2E}{A^2} = \frac{2 \cdot 1.10 J}{(0.11 m)^2}=181.8 N/m [/tex]

what happens when ice transform into steam

Answers

Liquid water can turn into a gas at any temperature. We say it evaporates. Evaporation happens fastest when water is heated to 212oF(100oC). When steam or water vapor cools down it turns back to liquid water

Answer:

The thermal kinetic energy of the molecules is raised

Explanation:

As it takes some amount of heat energy to be converted to thermal energy to turn ice into water and water into a stream. As this state change, the temperature will rise again. As the energy generated is being measured in Joule, a more commonly studied unit is a calorie. As matter vary in their capacity to absorb heat. Like ice needs about 0.50 as specific heat, water as 1.00 and stream 0.48 cal/g in degrees C. As the matter is heated the latent or hidden energy is released and tends to remain until the material changes its state.

When ultraviolet light with a wavelength of 254 nm falls on a clean copper surface, the stopping potential necessary to stop emission of photoelectrons is 0.181 v. part a what is the photoelectric threshold wavelength for this copper surface?

Answers

The ultraviolet wavelength λ = 254nm the stopping potential of copper surface,
V₀ = 0.18W
Now the relation between threshold wavelength and stopping potential is
eV₀ = λc (1/λ - 1/λ₀)
1/λ - 1/λ₀ = eV₀/λc
1/λ₀ = 1/λ eV/λc
= 1/ 254 × 10⁻⁹m - 1.6 10⁻¹⁹C)(0.181v)/6.625 × 10⁻³⁴ Js (3×10⁸m/s
0.00393 × 10⁹ - 0.01457×10⁷
= 0.378 ×10⁷
λ₀ = 264 × 10⁻⁹m or
264nm

The photoelectric threshold wavelength for this copper surface is 264 nm

Further explanation

The term of package of electromagnetic wave radiation energy was first introduced by Max Planck. He termed it with photons with the magnitude is :

[tex]\large {\boxed {E = h \times f}}[/tex]

E = Energi of A Photon ( Joule )

h = Planck's Constant ( 6.63 × 10⁻³⁴ Js )

f = Frequency of Eletromagnetic Wave ( Hz )

The photoelectric effect is an effect in which electrons are released from the metal surface when illuminated by electromagnetic waves with large enough of radiation energy.

[tex]\large {\boxed {E = \frac{1}{2}mv^2 + \Phi}}[/tex]

[tex]\large {\boxed {E = qV + \Phi}}[/tex]

E = Energi of A Photon ( Joule )

m = Mass of an Electron ( kg )

v = Electron Release Speed ( m/s )

Ф = Work Function of Metal ( Joule )

q = Charge of an Electron ( Coulomb )

V = Stopping Potential ( Volt )

Let us now tackle the problem !

Given:

λ = 254 nm = 2,54 × 10⁻⁷ m

V = 0.181 Volt

c = 3 × 10⁸ m/s

h = 6.63 × 10⁻³⁴ Js

q = 1.6 × 10⁻¹⁹ C

Unknown:

λ₀ = ?

Solution:

[tex]E = qV + \Phi[/tex]

[tex]h f = qV + h f_o[/tex]

[tex]h \frac{c}{\lambda} = qV + h \frac{c}{\lambda_o}[/tex]

[tex]6.63 \times 10^{-34} \times \frac{3 \times 10^8}{2.54 \times 10^{-7}} = 1.6 \times 10^{-19}(0.181) + 6.63 \times 10^{-34} \times \frac{3 \times 10^8}{\lambda_o}[/tex]

[tex]7.83 \times 10^{-19} = 2.896 \times 10^{-20} + \frac{1.989 \times 10^{-25}}{\lambda_o}[/tex]

[tex]\frac{1.989 \times 10^{-25}}{\lambda_o} = 7.83 \times 10^{-19} - 2.896 \times 10^{-20}[/tex]

[tex]\lambda_o \approx 2.64 \times 10^{-7} ~ m[/tex]

[tex]\large {\boxed{\lambda_o \approx 264 ~ nm} }[/tex]

Learn morePhotoelectric Effect : https://brainly.com/question/1408276Statements about the Photoelectric Effect : https://brainly.com/question/9260704Rutherford model and Photoelecric Effect : https://brainly.com/question/1458544

Answer details

Grade: College

Subject: Physics

Chapter: Quantum Physics

Keywords: Quantum , Physics , Photoelectric , Effect , Threshold , Wavelength , Stopping , Potential , Copper , Surface , Ultraviolet , Light

Which statement is true?

Voltage varies throughout a parallel circuit.

Voltage remains the same throughout a parallel circuit.

Answers

voltage remains the same throughout a parallel circuit

Final answer:

In a parallel circuit, the voltage remains constant throughout. An analogy using a bike path explanation further simplifies this concept.

Explanation:

In the world of physics, it is true to say: 'Voltage remains the same throughout a parallel circuit'. To further illustrate this concept, consider a bike path as an analogy for a circuit.

If a parallel circuit was a bike path, then each 'fork' in the path represents a separate path for the electricity. Think of the voltage as a measure of energy.

Even though cyclists (or charges) can take different paths (resistors), they all start at the same height (self-same voltage).

Therefore, they all have the same amount of potential energy (voltage) at any point.

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The map of the world is overlaid with the boundaries of the tectonic plates. Look at the location marked with an asterisk (*). What geologic feature would expect to find at that location and why? A) rift zone; two plates move in opposite directions B) island arc; two oceanic plates meet at a convergent boundary C) mountains; two continental plates meet at a convergent boundary D) deep sea trench; subduction where two plates meet and one goes underneath the other

Answers

C) mountains; two continental plates meet at a convergent boundary

How much heat in joules is needed to vaporize an 18.0 gram sample of water at 100c?

Answers

The water is already at its boiling point [tex](T=100^{\circ}C)[/tex], therefore we don't need additional heat to increase its temperature. Instead, we have to give the heat necessary to make it evaporate. The energy needed is equal to
[tex]Q=m L_v[/tex]
where
m is the mass of the water
Lv is the latent heat of evaporation

The latent heat of evaporation of water is [tex]L_v = 2265 J/g[/tex], and the mass of this sample of water is [tex]m=18.0 g[/tex], therefore the heat needed to vaporize the water is
[tex]Q=mL_v = (18.0 g)(2265 J/g)=4.08 \cdot 10^4 J =40.8 kJ[/tex]

Compute the resistance in ohms of a silver block 10 cm long and 0.10 cm2 in cross-sectional area. ( = 1.63 x 10-6 ohm-cm)

Answers

The resistance of the silver block is given by
[tex]R= \frac{\rho L}{A} [/tex]
where
[tex]\rho=1.63 \cdot 10^{-6} \Omega \cdot cm[/tex] is the silver resistivity
[tex]L=10 cm[/tex] is the length of the block
[tex]A=0.10 cm^2[/tex] is the cross-sectional area of the block

If we plug the data into the equation, we find the resistance of the silver block:
[tex]R= \frac{(1.63 \cdot 10^{-6} \Omega \cdot cm)(10 cm)}{0.10 cm^2}=1.63 \cdot 10^{-4} \Omega [/tex]

Answer:

1.6 x 10^-4 Ω

Explanation:

Nikolas had an idea that he could use the compressed carbon dioxide in a fire extinguisher to propel him on his skateboard.
Which of Newton’s laws would he have used to come up with this idea?

Answers

The Newton’s law Nikolas would use to come up with this idea is the Third law that states:

When one body exerts a force on a second body, the second body simultaneously exerts a force equal in magnitude and opposite in direction on the first body.

So, in this case, let's name the first Body A which is the skateboard and the second body B which is the compressed carbon dioxide in a fire extinguisher. Then, as shown in the figure below, according to the Third law:

[tex]FA = -FB[/tex]

Answer:

Newton's Third Law

Explanation:

Did the assignment

lion and leopard are two of Africa's large cat ____.

Answers

The fill in blank would be breeds.
Lions and leopards are both cats, but they are different kinds.

I hope this helps! Let me know if you need further explanation.
~Brooke❤️

A transformer is a device that increases or decreases voltage. t/f

Answers

A transformer is a device that increases or decreases voltage. t/f

The answer is: True my dude

Answer:

True.

Explanation:

A transformer is used either to increase or decrease the voltage.

It has two separate sets of coils of wire. The coils connected to the input voltage are called primary and the output coils are called secondary.

If number of windings (or coils) of wire in primary are less than the windings in secondary, it is a step up transformer because output voltage will be more than the input voltage. In this case the output voltage given out by the secondary will be more than the primary.

If the primary coils are more than the secondary, it is called a step down transformer. In this case, secondary voltage (output voltage) will be less than the primary.

light travels through a substance at 1.97x10^8. what is the index of the liquid?

Answers

In finding the index of refraction, we use this formula n= c/v

where n is the index of refraction
c is velocity of light in vacuum, this is constant and is equivalent to 3x10^8 m/s
v is the velocity of light in a particular medium, in here we use 1.97x10^8 m/s

Using the formula,

n = (3x10^8 m/s) / (1.9x10^8 m/s)
n = 1.52284264
n = 1.52

Hope this helps. :)

n = c / v
n = index of refractionc = velocity of light in vacuum = 3x10^8 m/sv = 1.97x10^8 m/s

n = (3x10^8 m/s) / (1.9x10^8 m/s)n = 1.52

the index of the liquid is 1.52

Octane is an important component of gasoline. Octane will ignite at a temperature of 428°F. What is this temperature on the Celsius scale?

Answers

The requirement is to change the °F to °C scale. That is;

T(°C) = [T(°F) - 32]/1.8

Substituting;

T(°C) = [428 - 32]/1.8 = 396/1.8 = 220 °C.

Therefore, 428°F will be 220°C on Celsius scale.

Two waves have the same speed. the first has twice the frequency of the second. compare the wavelength of the two waves. 1. the second has one third the wavelength of the first. 2. the first has half the wavelength of the second. 3. the first has one third the wavelength of the second. 4. the second has half the wavelength of the first. 5. they have the s

Answers

The basic relationship between frequency, wavelength and speed of a wave is
[tex]\lambda= \frac{v}{f} [/tex] (1)
where
[tex]\lambda[/tex] is the wavelength
v is the wave speed
f is the frequency

The problem says the two waves have same speed, so [tex]v_1 = v_2[/tex], and that the first wave has twice the frequency of the second wave, so
[tex]f_1 = 2 f_2[/tex]
If we use eq,(1), we can compare the two wavelengths
[tex]\lambda_1 = \frac{v_1}{f_1}= \frac{v_2}{2f_2}= \frac{1}{2} \frac{v_2}{f_2} = \frac{1}{2} \lambda_2 [/tex]
Where in the last step we used [tex]\lambda_2 = \frac{v_2}{f_2} [/tex]. Therefore, the first wave has half the wavelength of the second wave, so the correct option is option 2).

The atmosphere _________ most of the incoming visual radiation.
A. Absorbs
B. Transmits
C. Reflects

Answers

The answer is Transmit. The atmosphere transmit most of the incoming visual radiation.

Answer:

Absorbs

Explanation:

When the solar radiation or visual radiation arrives on Earth's atmosphere, most of the radiation is absorbed.

A part is reflected and transmitted back but major portion is absorbed by the atmosphere.

This absorb radiation helps to keep the Earth warm and thus maintaining the temperature even in Night time.

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The medical condition resulting from exposure to poison oak ivy or sumac is called Veronique has a spinner with three sections of equal size, red (r), green (g), and blue (b).The spinner is spun twice. The sample space for the possible outcomes is S = {rr, rb, rg, gr, gg, gb, br, bg, bb}. If the number of times red is spun is the random variable, X, which graph represents the probability distribution? which equations are equal to 1/4 (8x+56) =20 which action did the marbury v madison ruling make possiblea. a senator filifbusters a controversial bill because he believes it violates the bill of rightsb. the senate refuses to confirm one of the presidents nominees to the supreme courtc. the supreme court overturns a state law banning the publication of a novel some found offensived. a federal appellate court relies on precedent when ruling to uphold a states new tax laws in order to produce a current in a cell, the terminals must what?a. have a potential differenceb. be exposed to lightc. be in a liquidd. be at two different temperatures Mike saw 4 times and Many birds as Gigi. Mike saw 28 birds. Which equation can be used to find how many birds Gigi saw? a. 4x28=n b. 28-4=n c. 4+28=n d. 28+4=n Which of these was a northern advantage at the start of the civil war? 1 point fighting in familiar territory highly trained soldiers control of the mississippi river abundant natural resources? What is the structure that is needed to process a menu selection? In the 1930s Center long read receipts from a cookbook for 15 hours during a senate debate his action in this example of The so-called "new" theories, unlike the grand theories, are multicultural and multidisciplinary. _____ theory, for example, draws on education, anthropology, and history. What are some of the reasons that membership in labor unions declined in the 1950s? One argument in favor of labor unions is that they: A.help create many new jobs.B.support both owners and workers.C.give workers job security.D.eliminate unqualified workersANSWER! C. Give workers job security with transcendentalism, who possesses the power to transcend the material world to find the meaning of life?A.all poetsB.politicians C.all individuals D.families How many calories should I eat to maintain my weight? How could the relationship of the data be classified? scatter plot with points scattered going up to the rightA fairly strong positive correlationA fairly strong negative correlationA fairly weak negative correlation the area of a circle is 452.39 ft^2 . Why would the diameter have to be? describe the steps you would use to factor 2x ^ 3 + 5x ^ 2 - 8x - 20 completely then State the factored form. this isn't multiple choice btw To win at lotto in a certain state, one must correctly select 6 numbers from a collection of 50 numbers (one through 50). the order in which the selections is made does not matter. how many different selections are possible? In your own words, explain what the summary equation tells you about cellular respiration. $80 is divided Between two men such that 1/4 of one persons share is equal to 1/6 Of the other how much will each man receive