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Q.

A string of linear mass density 0.8 kg/m is stretched to a tension 500 N. The mean power required to maintain a travelling wave of amplitude of 10 mm and Wavelength 0.5 m is

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a

70 W

b

85.3 W

c

987 W

d

100 W

answer is D.

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Detailed Solution

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ω=2πvλ=100π rads-1  and v=Tμ=25 ms-1

 P=12μω2a2v=100 W

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