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The Doppler effect

The Doppler effect occurs withA only water waves.B only sound waves.C only transverse waves.D all waves.

D all waves.

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The Doppler effect is characteristic ofA light waves.B sound waves.C water waves.D all of the above choicesE none of the above choices

D all of the above choices

A light source that moves away from an observer at very high speeds (more than half the speed of light)will appearA more yellowB the same colorC more redD more blue

C more red

When a sound source approaches you, the pitch you hear isA lower than when the source is stationary.B higher than when the source is stationary.C the same as when the source is stationary.D first higher and then lower than the pitch of the source when stationary.

B higher than when the source is stationary.

The Doppler shift explainsA why it is that our hearing is best near 3000 Hz.B the phenomenon of beats.C why the siren on a police car changes its pitch as it races past us.D why a sound grows quieter as we move away from the source.E how sonar works.

C why the siren on a police car changes its pitch as it races past us.

A Doppler effect occurs when a source of sound movesA away from you.B either towards you or away from you.C towards you.D in a circle around you.

B either towards you or away from you.

A sound source departs from a stationary observer. The frequency heard by the observer isA higher than the source.B equal to zero.C lower than the source.D the same as that of the source.

C lower than the source.

Sound travels faster inA water.B air.C steel.D a vacuum.E Sound travels at about the same speed in all of the above media.

C steel.

An ambulance siren sounds different as it approaches you than when it moves away from you. What scientific term would you use to explain how this happens?A ultrasoundB rarefactionC diffractionD the Doppler effect

D the Doppler effect

Due to the Doppler effect, the pitch of the siren of a fire truck moving away from you:A does not change.B increases.C decreases.D increases then decreases.

C decreases.

A sonic boom isA an explosion created when an airplane moves faster than the speed of soundB Engine noise that moves faster than the speed of soundC a loud noise created by a pressure wave that follows an object moving faster than the speed of soundD A loud noise that moves faster than the speed of sound

C a loud noise created by a pressure wave that follows an object moving faster than the speed of sound

A train moves down the track toward an observer. The sound from the train, as heard by the observer, is ____ the sound heard by a passenger on the train.A a different timbre thanB higher in pitch thanC lower in pitch thanD the same as

B higher in pitch than

A light source that moves towards an observer at very high speeds (more than half the speed of light) will appearA more yellowB the same colorC more redD more blue

D more blue

The exceeding the normal speed of sound in air is: term applied to objects that travel at speedsA subsonic.B sonogram.C supersonic.D reverberation.

C supersonic.

As a source of continuous sound approaches a constant speed, you will be aware of an apparent increasing of itsA loudness and wavelength.B loudness, frequency, and wavelength.C frequency and wavelength.D loudness and frequency.E None of the above choices are correct.

E None of the above choices are correct.

If you are on a train, how will the pitch of the train’s whistle sound to you as the train moves?A The pitch will become steadily higher.B The pitch will become steadily lower.C The pitch will become higher, then becomelower.D The pitch will not change.

D The pitch will not change.

Sound waves cannot travel inA steel.B a vacuum.C water.D air.E any of the above media

B a vacuum.

A sound source approaches a stationary observer. The frequency heard by the observer isA lower than the source.B the same as that of the source.C equal to zero.D higher than the source.

D higher than the source.

At a concert the oboe is playing a long steady note as you walk away from the stage at an accelerating velocity toward the rest room. The pitch of the sound that you hear, isA continually increasing.B continually decreasing.C steady but lower than normal.D steady but higher than normalE None of the above choices are correct.

B continually decreasing.

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