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November 28, 2014

November 28, 2014

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

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

271.2-243 is not the correct answer

- physics--please help -
**Elena**, Sunday, April 1, 2012 at 6:08pm40.8 mph = 18.24 m/s

(a) Frequency at hill (approaching source) = 243• ( 1/(1 - 18.24 /340) ) Hz = 271.2 Hz

(b) Reflected frequency at car (effective approaching source) = 271.2• ( 1/(1 - 18.24 /340) Hz = 271.2 Hz

(c) Beat frequency is equal to the absolute value of the difference in frequency of the two waves.

The beat frequency = 271.2 Hz received - 243 Hz transmitted = 28.2 Hz

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