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The frequency of vibration of 20cm lengt...

The frequency of vibration of 20cm length of a sonometer wire (linear density is 0.0294 gm/cm) under a tension 3kg wt is

A

750 Hz

B

500 Hz

C

250 Hz

D

125 Hz

Text Solution

Verified by Experts

The correct Answer is:
C
`n=(1)/(2l) sqrt(T/m) = (1)/(1xx20xx10^(-2)) sqrt((3xx9.8)/(2.94xx10^(-4)))`
`=100/40 xx10^2 = 250Hz`
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