Question

A sound wave of frequency f=300Hz produced by a moving source 40m/s is observed by a stationary observer. The speed of sound in ambient air is 345 m/s.

- As the source moves toward the observer, how far does the source travel between subsequent wave pulses?
- What is the apparent wavelength of the sound wave as perceived by the observer?
- What is the frequency of sound perceived by the observer?
*Note, when the source is in motion, the speed of the sound waves remains the same to both the observer and the source.*

Answer #1

A sound source moves through air toward a stationary observer.
The frequency of the sound the observer hears is 20.0% higher than
the source frequency. How fast is the source moving?
Answer: 30.6 sec

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(a) fL > fR
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(c) fL = fR
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