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  • A string of length 0.4 m and mass 0.0 1 kg is clamped at its ends. The tension in the string is 1.6 N. When a pulse travels along the string, the shape of the string found to be same after time t.

A string of length 0.4 m and mass 0.0 1 kg is clamped at its ends. The tension in the string is 1.6 N. When a pulse travels along the string, the shape of the string found to be same after time t. Find the value of t.

 

Option: 1

0.2 sec


Option: 2

0.4 sec


Option: 3

0.5 sec


Option: 4

0.1 sec


Answers (1)

best_answer

\text{Speed of pulse,} V=\sqrt{\frac{F}{\mu}}\\\\ v=\sqrt{\frac{1.6}{\left(\frac{0.01}{0.4}\right)}}=8 \mathrm{~m} / \mathrm{s}\\\\ \text {Required time,} t=\frac{2 l}{V}= \frac{2 \times 0.4}{8} \Rightarrow 0.1 \mathrm{sec}

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