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Q.

A tuning fork vibrating with.a sonomocter having 20 cm wire produces 5 beats per second. The beat frequency does not change if the length of the wire is changed to 21 cm. The frequency of the tuning fork (in Hz) must be

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a

215

b

200

c

205

d

210

answer is C.

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Detailed Solution

V2l1=(n+5) V2l2=(n−5) l2l1=n+5n−5  or  2120=n+5n−5 Solving, we Bet n = 205 HZ

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