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Two tuning forks when sounded together produce 5 beats per second. The frequency of one of them is 250 Hz. When the other fork is slightly loaded, they produce 7 beats/s. Then the frequency of other tuning fork without loading is

A

243 Hz

B

255 Hz

C

245 Hz

D

257 Hz

Text Solution

Verified by Experts

The correct Answer is:
C
`n_(2) = n_(1) +- 5`
`= 250 +- 5 = 255 or 245`
`n_(2) = n_(1) + 7`
`= 250 +- 7 = 257 or 243`
`n_(2)` is loaded it frequency decreases before loading increases by 2 difference of beat frequency
`n_(2) = 245Hz`
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