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Q.

A tuning fork of frequency ‘x’ produces 8 beats/second with frequency 250 Hz and 12 beats/second with 270 Hz. Here value of ‘x’ is

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a

282 Hz      

b

242 Hz

c

258 Hz

d

262 Hz  

answer is D.

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Detailed Solution

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n~250=8

n~270=12

⇒250−n=8               270−n=12                n=242Hz            n=258

But both conditions satisfied by n = 258Hz

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