Two identical piano wires have a fundamental frequency of 600 cycle per second when kept under the same tension. What fractional increase in the tension of one wire will lead to the occurrence of 6 beats per second when both wires vibrate simultaneously?

Options

A. 0.01
B. 0.02
C. 0.03
D. 0.04

Answer

B

Explanation

`n=1/(2l)sqrt(T/m)`
`/_\n/n=1/2(/_\T)/T`
`implies 6/600=1/2(/_\T)/T`
`:. /_\ T=(12T)/600=0.02T`