Tuning fork A of frequency 205 Hz produc...

Tuning fork A of frequency 205 Hz produces 5 beats/sec with another fork B. After filing the tuning fork B, it produces 3 beats/sec with A. What was the frequency of the fork B before filling?

310 Hz

313 Hz

308 Hz

300 Hz

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The correct Answer is:

Frequency of A: `n_(A) = 305 Hz`
`n_B` may be `305-+5` or `310 Hz` or `300 Hz`
When B is field, its frequency is increased. If `n_B = 310 Hz` then the number of beats/s will increase and they will be more then 5. But if `n_B = 300 Hz`, then on filing it may become 302Hz and we can get 3beat/s.
`:. n_B = 300Hz`

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