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Q.

A tuning fork produces 4 beats per sec with one fork of frequency 288 cps.  A little wax is placed on the unknown fork and it produces 2 beats per second.  The frequency of unknown fork is

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a

286 cps

b

294 cps

c

288 cps

d

292 cps

answer is B.

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Detailed Solution

Wax attached, beat frequency decrees. so 
n1>n2⇒ n1−n2=4
n1=n2+4=288+4=292 CPS

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