A string is clamped at both the ends and it is vibrating in its 4th harmonic. The equation of th...

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A string is clamped at both the ends and it is vibrating in its 4th 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) \( 60 \mathrm{~m} \)
(b) \( 40 \mathrm{~m} \)
(c) \( 80 \mathrm{~m} \)
(d) \( 20 \mathrm{~m} \)
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