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A string is clamped at both the ends and...

A string is clamped at both the ends and it is vibrating in its `4^(th)` harmonic. The equation of the stationary wave is `Y=0.3 sin ( 0.157 x) cos (200 pi t)`. The length of the string is: (All quantities are in SI units.)

A

20 m

B

60 m

C

40 m

D

80 m

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The correct Answer is:
D
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