You are traveling in a car toward a hill at a speed of 40.0 mph. The car's horn emits sound waves of frequency 250 Hz, which move with a speed of 340 m/s.
a) Determine the frequency with which the waves strike the hill.
b) What is the frequency of the reflected sound waves you hear?
c) What is the beat frequency produced by the direct and the
reflected sounds at your ears?
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