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A tuning fork of known frequency 256 Hz ...

A tuning fork of known frequency `256 Hz` makes `5` beats per second with the vibrating string of a piano. The beat frequency decreases to `2` beats per second when the tension in the piano string is slightly increased. The frequency of the piano string before increasing the tension was

A

256 + 5 Hz

B

256 + 2Hz

C

256 – 2 Hz

D

256 – 5Hz

Text Solution

Verified by Experts

The correct Answer is:
D
`f_(A)=256Hz,f_("beat")=5`
As `Tuarr` (i.e. `f_(B)uarr`), `f_("beat")darr`
`f_(A)-f_(B)=f_("beat")` (Possible)
`implies f_(B)=256-5Hz`.
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