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If a string fixed at both ends, vibrates...

If a string fixed at both ends, vibrates in its fourth harmonic, the wavelength is 15 cm. What is the length of the string ?

A

20 c m

B

30cm

C

25 cm

D

40 cm

Text Solution

Verified by Experts

The correct Answer is:
B
For the fourth harmonic, there are four loops.
` :. ` Length of one loop ` = lambda/2`
` :. ` Length of the string ` = 4( lambda/2) = 4 xx 15/2 = 30` cm
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