An unknown frequency x produces 8 beats ...

An unknown frequency x produces 8 beats per second with a frequency of 250 Hz 12 betas with 270 Hz source, then x is :

258 hz

242 hz

262 Hz

none of these

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The correct Answer is:

v = 250` pm 12 " " rArr` v = 258 or 242 Hz.
also v = 270 `pm 12 " " rArr v = 258 or 282 `Hz.
hence v = 258 Hz.
correct choice is (a) .

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