Waves - Result Question 48

50. A string of $7 m$ length has a mass of $0.035 kg$. If tension in the string is $60.5 N$, then speed of a wave on the string is

[2001, 1989]

(a) $77 m / s$

(b) $102 m / s$

(c) $110 m / s$

(d) $165 m / s$

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Answer:

Correct Answer: 50. (c)

Solution:

  1. (c) Given : Length $(l)=7 m$

Mass $(M)=0.035 kg$ and tension $(T)=60.5 N$.

Therefore, mass of string per unit length $(m)=$ $\frac{0.035}{7}=0.005 kg / m$

speed of wave, $=\sqrt{\frac{T}{m}}$

$\Rightarrow \sqrt{\frac{60.5}{0.005}}=110 m / s$



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