Question

A stationary source S generates circular outgoing waves on a lake. The wave speed is 5.0 m/s and the crest-to-crest distance is 2.0 m. A person in a motor boat heads directly toward S at 3.0 m/s. To this person, the frequency of these waves is:
A) 1.0 Hz
B) 1.5 Hz
C) 2.0 Hz
D) 4.0 Hz
E) 8.0 Hz

Answer

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