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WorksheetsDoppler and Decibels
Total questions: 10
Worksheet time: 8mins
Which of the following are examples of the Doppler Effect? (Check all that apply)
The pitch of a sound can change depending on whether the sound source is moving towards you, moving away from you, or is stationary.
The color an object is can change depending on whether the light source is moving towards you, moving away from your, or is stationary.
The further a sound source is away from you, the quieter the sound is.
Sunlight striking millions of raindrops in the air causing a rainbow to appear.
A sound source is moving to the right as in the image shown. Compared to the sound made when the source is stationary, the sound you would hear at Position #2 would be ...
higher in pitch.
lower in pitch.
louder.
the same.
A sound source is moving to the right as in the image shown. Compared to the sound made when the source is stationary, the sound you would hear at Position #1 would be ...
higher in pitch.
lower in pitch.
quieter.
the same.
When observing distant galaxies, astronomers have found that the light they see has been "redshifted" -- the wavelengths are longer than they should be. According to the Doppler Effect, this means:
those galaxies are moving away from us.
those galaxies are moving towards us.
those galaxies are dimmer than the Milky Way.
those galaxies are very old.
According to the Doppler Effect, the change in pitch of a sound is the same if (a) the source is moving away from the listener or (b) the listener is the one that is moving away.
True
False
Which of the following statements are true about the decibel scale (check all that apply):
Decibels are used to measure sound intensity or how loud a sound is.
The closer you are to a sound source, the higher that sound will be on the decibel scale.
The numeric values of the decibel scale are based on powers of ten -- it's a logarithmic scale.
Decibels can be used for other types of waves as well, such as seismic waves and radio waves.
A sound has a loudness of 60 dB. What would its loudness be if the intensity were increased by a factor of 1000?
30 dB
63 dB
90 dB
It would stay the same. Loudness and intensity are different, unrelated things.
A sound has a loudness of 120 dB. What would its loudness be if the intensity were decreased by a factor of 100?
20 dB
100 dB
140 dB
It would stay the same. Loudness and intensity are different, unrelated things.
A sound has a loudness of 60 dB. What would its loudness be if the intensity were increased by a factor of 100,000?
10 dB
65 dB
110 dB
It would stay the same. Loudness and intensity are different, unrelated things.
A sound has a loudness of 60 dB. What would its loudness be if the intensity were decreased by a factor of 1,000,000?
0 dB
120 dB
It's impossible to change the intensity of a sound by that much.
Since there still is some sound, it would have to have a value of at least 1 dB.
