Doppler

What is the Doppler Effect?

• A change in frequency due to the relative motion of a wave source and an observer

• When a wave overlaps with another wave

• When a wave bounces off of another object

• When a wave bends due to traveling through a different medium

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When the car moves AWAY from you, its horn seems...

• Low pitched

• High pitched

• Normal

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The Doppler effect is seen when a wave-making source moves toward an observer. 

• True

• False

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In this clip, the sound of the jet illustrates the doppler effect AS OBSERVED BY

• The man on the ground

• The pilot in the jet

• Both the man on the ground and the pilot in the jet

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Which of the following best describes the Doppler effect?

• A change in amplitude due to distance

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

• A change in wavelength due to temperature

• A change in speed due to medium

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Describe how the Doppler effect explains the change in pitch of a siren as an ambulance passes by an observer.

• The pitch remains constant as the ambulance moves.

• The pitch increases as the ambulance approaches and decreases as it moves away.

• The pitch decreases as the ambulance approaches and increases as it moves away.

• The pitch is unrelated to the movement of the ambulance.

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This effect is the change in wavelength of sound or light caused by the motion of the source, the observer or both.

• Newton effect

• Doppler effect

• Einstein effect

• Galileo effect

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Which is an example of the doppler effect?

• The delay in sound between the lightning and thunder.

• When you can no longer hear a sound as the pitch increases.

• 
  The apparent change in pitch of a police siren as it passes you.

• 
  The change in pressure in your ears when driving up a mountain.

What is the effect of the Doppler effect on the sound of a car horn as the car approaches and then moves away from an observer?

• The sound remains constant

• The sound decreases in frequency as it approaches

• The sound increases in frequency as it approaches and decreases as it moves away

• The sound increases in amplitude as it moves away

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As a sound source approaches an observer _____________.

• Pitch becomes higher

• Pitch becomes lower

• Pitch stays the same

• Pitch disappears

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