First slide

Speed of wave

Question

A string of length 10 0 m and mass 1.25kg is stretched with a tension of 50 N. If a transverse pulse is created at one end of the string, how Iong does it take to reach the other end ?

Easy

A

0.5s
B

1 sec
C

2s
D

4 sec

Solution

Here $e m = \frac{1 \cdot 25 k g}{10 \cdot 0 m} = 0 \cdot 125 k g / m N o w V = \sqrt{(\frac{T}{m})} = \sqrt{(\frac{50}{0 \cdot 125})} = 20 m / s Time taken = \frac{l}{V} = \frac{10 \cdot 0}{20} = 0 \cdot 5 s$

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