Wednesday

April 23, 2014

April 23, 2014

Posted by **taylor** on Monday, March 4, 2013 at 1:28am.

- physics -
**drwls**, Monday, March 4, 2013 at 6:05amAre you riding away from a reflecting surface and listening for the echo? If so, use the appropriate Doppler shift formula, with a received frequency of 20 kHz. Let the speed of sound be a.

The answer will be approximately

2 V/a = 1.0kHz /20 kHz = 0.05

V = (1/2)*0.05*330 = 33 m/s = 118 km/h = 74 mph

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