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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 |
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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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