Question: A fixed ( at rest ) source emits a sound of frequency 1 0 0 0 Hz . What is the frequency as heard by

A fixed (at rest) source emits a sound of frequency 1000 Hz . What is the frequency as heard by an observer:
a. at rest.
b. moving toward the source at a constant speed of 20ms.
c. moving away from the source at the same rate.
A fixed ( at rest ) source emits a sound of

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