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A sonometer wire of length 79 cm emits a...

A sonometer wire of length 79 cm emits a note of frequency 234 Hz. The length of the wire is then reduced by 1 cm and is allowed to vibrate. How many beats will be produced per sec with a tuning fork of frequency 240 Hz ?

A

2

B

3

C

4

D

5

Text Solution

Verified by Experts

The correct Answer is:
B
`n_(2)/n_(1) = l_(1)/l_(2) = 79/78 :. n_(2) = 79/78 xx 234 = 237` Hz
` :. ` No. of beats/sec ` = 240 - 237 = 3`
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