Q.

A 20 cm long string, having a mass of 1g is fixed at both the ends. The tension in the  string is 0.5 N. the string is set into vibrations using an external vibrator of frequency  100Hz. Find the separation (in cm) between the successive nodes in the string.

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answer is 5.

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Detailed Solution

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 f=n2LFμ100=n2(0.2)0.5103×0.2n=4
 4×λ2=20cmλ2=5cm 

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