The stirng stretched by tension T and length L vibrates in resonance with a tuning fork of frequency n. the tension in the stretched string is increas
The stirng stretched by tension T and length L vibrates in resonance with a tuning fork of frequency n. the tension in the stretched string is increased by 69% and length of string reduced by 35%. Then, the frequency of vibrating string is
A. n
B. 1.5n
C. 2n
D. n/2
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Correct Answer - C
`n_2/n_1 = l_1/l_2 sqrt(T_2/T_1)`
`=(l_1)/(65/100l_1) xx sqrt(169/100) = 100/65 xx13/10`
`=130/65 = 2`
`n_2=2n`
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