Q.

Two perfectly identical wires are in unison. When the tension in one wire is increased by 1%, then on sounding them together 3 beats are heard in 2 sec. The initial frequency of each wire is :

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a

220 s-1

b

320 s-1

c

150 s-1

d

300 s-1

answer is D.

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Detailed Solution

Similar to Q. 30 Initial frequency of each wire (n)    =(Number of beats heared per sec)×200(per centage change in tension of the wire)    =(3/2)×2001=300sec−1
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