Wave Mechanics Vibration Of String Question 35
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 :
[Pb. PET 2002]
Options:
A) $ 220{{s}^{-1}} $
B) $ 320{{s}^{-1}} $
C) $ 150{{s}^{-1}} $
D) $ 300{{s}^{-1}} $
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Answer:
Correct Answer: D
Solution:
Similar to Q.
30 Initial frequency of each wire (n) $ =\frac{\text{(Number}\ of\ beats\ heard\ per\ \text{sec)}\times 200}{\text{(percentage}\ change\ in\ tension\ of\ the\ \text{wire)}} $
$ =\frac{(3/2)\times 200}{1}=300{{\sec }^{-1}} $
BETA
