Q.

A tuning fork and a sonometer wire were sounded together and produce 4 beats per second. When the length of sonometer wire is 95 cm or 100 cm, the frequency of the tuning fork is

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a

156 Hz

b

152 Hz

c

148 Hz

d

160 Hz

answer is A.

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Detailed Solution

Probable frequencies of tuning fork be n+4 or n-4 Frequency of sonometer wire n∝1l∴n+4n−4=10095 or  95 (n+4)=100(n−4) or 95n+380=100n−400 or 5n=780 or  n=156 Hz
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