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A tuning fork vibrating with a sonometer...

A tuning fork vibrating with a sonometer having 20 cm wire produces 5 beats per second. The beat frequency does not change if the length of the wire is changed to 21 cm. The frequency of the tuning fork (in Hertz) must be

A

200

B

210

C

205

D

215

Text Solution

Verified by Experts

The correct Answer is:
C
`fprop(1)/(l)`
`f_(1)l_(1)=f_(2)l_(2)`
`implies (N+5)xx20=(N-5)xx21`
N `rarr` frequency of tunning fork be N
implies N = 205 Hz.
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