Posted by **sara** on Sunday, April 1, 2012 at 10:53am.

You are traveling in a car toward a hill at a speed of 40.8 mph. The car's horn emits sound waves of frequency 243 Hz, which move with a speed of 340 m/s.The frequency with which the waves strike the hill is 254.7Hz and the frequency of the reflected sound waves you hear 271.2 Hz.

What is the beat frequency produced by the direct and the reflected sounds at your ears?

271.2-243 is not the correct answer

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