College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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A sound source vibrates with a frequency f when it is at rest. When the sound source moves with constant velocity (less than the speed of sound) through the air, an observer who is at rest relative to the air hears a sound whose frequency is appreciably different from f because:
- The speed of sound in the air increases because of the motion of the source.
- The motion of the source changes its frequency of vibration.
- The speed of the sound relative to the observer changes.
- The speed of sound in the air decreases because of the motion of the source.
- The wavelength established in the air is not the same as it would be if the source were at rest.
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