A string is clamped at both the ends and it is vibrating in its \( 4^{\text {th }} \) harmonic. ....

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A string is clamped at both the ends and it is vibrating in its \( 4^{\text {th }} \) harmonic. The equation of the
\( \mathrm{P} \)
stationary wave is \( \mathrm{Y}=0.3 \sin (0.157 \mathrm{x}) \cos (200 \mathrm{At}) \).
W
The length of the string is: (All quantities are in SI units.)
(1) \( 20 \mathrm{~m} \)
(2) \( 80 \mathrm{~m} \)
(3) \( 40 \mathrm{~m} \)
(4) \( 60 \mathrm{~m} \)


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