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If the vibrating length of a string is i...

If the vibrating length of a string is increased by `25%`, then its fundamental frequency will

A

increase by `25%`

B

decrease by `25%`

C

decrease by `20%`

D

decrease by `25%`

Text Solution

Verified by Experts

The correct Answer is:
C
`n_(1)/n_(2) = l_(2)/l_(1) = (5l_(1))/(4l_(1)) :. n_(2) = 4/5 n_(1)`
i.e. the frequency is decreased by ` 1/5` times or 20%
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