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Q.

Tuning fork A of frequency 258 Hz gives 8 beats with a tuning fork B. When the tuning fork A is filed and again A and B are sounded the number of beats heard decreases. The frequency of B is

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a

250 Hz

b

266 Hz

c

258 Hz

d

242 Hz

answer is B.

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Detailed Solution

nA = 258Hz  ; n = 8b/s 
nA  will increase on filing, So the frequency gets closer to nB.( Since the number of beats decreases).

So nB>nA⇒ nB = nA - n = 258 + 8 =266 Hz

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Tuning fork A of frequency 258 Hz gives 8 beats with a tuning fork B. When the tuning fork A is filed and again A and B are sounded the number of beats heard decreases. The frequency of B is