Posted by **sara** on Saturday, March 31, 2012 at 9:14pm.

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?

- physics -
**Damon**, Saturday, March 31, 2012 at 9:16pm
271.2 - 243

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**Damon**, Saturday, March 31, 2012 at 9:19pm
The rest of it with the Doppler shift information is just to confuse the student. At your ear, you send 243 and get back 271.2

- physics -
**sara**, Saturday, March 31, 2012 at 9:21pm
This doesn't give me the correct answer

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