First slide

Beats

Question

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 :

Moderate

A

220 s^-1
B

320 s^-1
C

150 s^-1
D

300 s^-1

Solution

Similar to Q. 30
Initial frequency of each wire (n)
$= \frac{(Number of beats heared per sec) \times 200}{(per centage change in tension of the wire)}$
$= \frac{(3 / 2) \times 200}{1} = 300 \sec^{- 1}$

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