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When a source moves toward the Earth its wavelength is shortened, a phenomenon known as blueshift. When a source moves away from the Earth its wavelength is increased, a phenomenon known as redshift.

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9y ago
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6y ago

Only the amplitude changes. It decays with distance from the speaker, by inverse-square law. The wave-speed and the frequency do not change.

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12y ago

The frequency seems to change (this is the doppler effect).

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Q: When a listener moves toward or away from a source of sound does the wave speed or wave frequency change?
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Why does the frequency of sound waves change for a listener when the sound source move toward or away from the listener?

This is an example of the Doppler effect. Sound is composed of waves. A particular vibration produces a sound wave with a particular wavelength. When the sound source moves towards a listener the waves are "bunched up". That results in a shorter observed wavelength and thus a higher frequency. When the sound source moves away the opposite happens. The frequency of the sound waves decreases.


Can you change the frequency of em wave?

Once the wave has left the source that generated it, the frequency can't be changed.If you happen to be moving toward or away from the source at a high enoughspeed, then the frequency of the radiation may appear to you to be changed.But it's not.


What is the perception in the change of a sound's feequency as the source moves?

when the source moves toward stationary observer the frequency increase because wavelength gets shorter.


Will the listener notice the Doppler effect if he or she and the source of the sound are traveling toward each other?

yes


What happens to a frequency heard when an observer begins toward the stationary source of a sound?

.The frequency increases


If you are moving toward the source of a sound wave and then pass the source and continue moving away the will change.?

The pitch becomes lower because the sound waves are no longer compressed once the source passes you.


Will a listener notice the Doppler effect if he or she and the source or the sound are traveling toward each other Explain?

maybe, I'm not quite sure.


When a wave source moves toward a receiver does the receiver encounter increase in frequency wave speed or both?

Increase in frequency only.


Will a listener notice the Doppler effect if he or she and the source of the sound are traveling toward each other?

Answer:Frequency - for nova net


When you are moving toward a stationary source of a sound its frequency will appear lower than it actually?

False


What causes a sound to change pitch?

A change of pitch in a sound is caused by a change of wavelength. This can be caused by a change in length or size of the vibrating or oscillating device or system causing the sound. When you press on a guitar string at one of the frets, for instance, you shorten the vibrating part of the string thereby shortening its wavelength and increasing its pitch - shorter wavelength = higher pitch.*The pitch of a sound can also be changed by movement of the sound source away from or toward the listener. This is called Doppler effect. Moving away, the waves become stretched resulting in a lower pitch, and vice versa when moving toward the listener.*Keep in mind that all sound waves travel at the same speed, so shorter wavelengths will reach your ears in greater numbers per second than longer wavelengths. This is called frequency. Higher frequency = higher pitch and, again, vice versa.


What lets you know that the source of a sound is moving toward or away from you?

When a sound-source moves toward you, its pitch gets higher and the sound gets louder. When it moves away, the pitch lowers and it gets quieter. The frequency change is called the Doppler shift.