JEE MAIN - Physics (2021 - 25th February Evening Shift - No. 21)

The percentage increase in the speed of transverse waves produced in a stretched string if the tension is increased by 4%, will be __________%.
Answer
2

Explanation

Speed of transverse wave is

$$V = \sqrt {{T \over \mu }} $$

$$\ln V = {1 \over 2}\ln T - {1 \over 2}\ln \mu $$

$${{\Delta V} \over V} = {1 \over 2}{{\Delta T} \over T}$$

$$ = {1 \over 2} \times 4$$

$$ \Rightarrow $$ $${{\Delta V} \over V} = 2\% $$

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