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September 16, 2014

September 16, 2014

Posted by **COFFEE** on Saturday, April 21, 2007 at 11:33pm.

(a) the listener is standing still and the tuning forks both move to the right at 30 m/s

(b) the tuning forks are stationary and the listener moves to the right at 30 m/s

I tried using:

f' = f [(v +/- vD)]/[(v +/- vS)]

f' = (329.6)[(343 - 0)/(343-30)]

f' = 31.6 Hz

Is this correct?

The results will be slghtly different for the two cases. You have the correct formula but did not use it properly.

For case (b), the two frequencies received are

329.6(343/313) and 329.6(343/373) = 361.2 and 303.1 and the beat frequency is 58.1 Hz.

For case (a), the frequencies are

329.6(313/343) and 329.6(373/343) = 300.8 and 358.4m and the beat frequency is 57.6 Hz.

ok thanks a lot!

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