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Q.

A source of unknown frequency produces 12 beats per second with a source of frequency 240 Hz, and 8 beats per second with another source of frequency 260 Hz. The unknown frequency will be 

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a

252 Hz

b

292 Hz

c

268 Hz

d

272 Hz

answer is D.

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Detailed Solution

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f−240=12......(1) and 260−f=8......(2)

Solving f=252 Hz

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A source of unknown frequency produces 12 beats per second with a source of frequency 240 Hz, and 8 beats per second with another source of frequency 260 Hz. The unknown frequency will be