1.

The frequency of vibration of 20cm length of a sonometer wire (linear density is 0.0294 gm/cm) under a tension 3kg wt is (g=`980cm//s^2`)A. 750HzB. 250HzC. 500HzD. 125Hz

Answer» Correct Answer - B
`n=(1)/(2l) sqrt(T/m) = (1)/(2xx20) sqrt((3000xx980)/(0.294))`
`=1/40xxsqrt((294xx10^4)/(294xx10^(-4)))`
`=1/40 sqrt(108) = 104/40`
`=(10000)/(40)`
`=250Hz`


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