The speed of a wave on a string is \( 150 \mathrm{~m} / \mathrm{s} ...

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The speed of a wave on a string is \( 150 \mathrm{~m} / \mathrm{s} \) when the tension is \( 120 \mathrm{~N} \). The percentage increase in the tension in order to
\( \mathrm{P} \) raise the wave speed by \( 20 \% \) is
[BHU 2006]
(a) \( 44 \% \)
(b) \( 40 \% \)
W
(c) \( 20 \% \)
(d) \( 10 \% \)
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