Doppler Effect

What does the Doppler effect denote?

• A change in temperature

• A change in sound or light wave frequency

• A change in color

• A change in speed

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What happens to the pitch of a sound as the source moves towards you?

• The pitch becomes lower

• The pitch remains the same

• The pitch becomes higher

• The pitch disappears

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How are wavelength and frequency related?

• Higher frequency means longer wavelength

• Higher frequency means shorter wavelength

• Frequency and wavelength are unrelated

• Higher frequency means no wavelength

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What is a simple way to remember how wavelengths change?

• Wavelengths are like a rubber band

• Wavelengths are like a spring

• Wavelengths are like a rope

• Wavelengths are like a chain

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What is the Doppler effect?

• A change in the frequency of a wave due to the motion of the source or observer

• A type of electromagnetic radiation

• A method to measure temperature

• A technique for sound amplification

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What is a spectrum?

• A collection of sound waves

• An arrangement of electromagnetic radiation by wavelength

• A type of musical scale

• A method for measuring speed

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What does a blueshift indicate?

• An increase in wavelength

• A decrease in wavelength

• A change in temperature

• A change in amplitude

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What is radial velocity (Vr)?

• The speed of light in a vacuum

• The velocity directed straight at or away from an object

• The speed of sound in air

• The velocity of a rotating object

What happens to the light from a star moving away from Earth?

• It experiences a blueshift

• It experiences a redshift

• It remains unchanged

• It becomes invisible

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What happens to the spectral lines when Earth moves towards a star?

• They are redshifted.

• They are blueshifted.

• They remain unchanged.

• They disappear.

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