Respuesta :
Answer:
Doppler effect is a change in frequency and wavelength of a wave. It is caused by the change in distance between the thing creating the wave (causer) and whatever is measuring seeing or hearing the wave (watcher or observer). Another word for "causer" is "sender".
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Answer:
As a sound source moves away from a stationary object, the sound waves are compressed, increasing the pitch.
Explanation:
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