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A tuning fork of frequency 400 Hz is moved away from an observer and toward a flat wall with a speed of 2.0 m/s. What is the apparent frequency (a) of the unreflected sound waves coming directly to the observer, and (b) of the sound waves coming to the observer after reflection? (c) How many beats per second are heard? Assume the speed of sound in air to be 340 m/s. |
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