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An unknown frequency x produces 8 beats ...

An unknown frequency `x` produces 8 beats per seconds with a freuquency of `250` Hz and 12 beats with `270Hz`. Source then `x` is

A

242 Hz

B

258 Hz

C

282 Hz

D

262 Hz

Text Solution

Verified by Experts

The correct Answer is:
B
Since there are 8 beats/s, x may be `250 -+ 8`or 258 Hz or 242 Hz
Similarly for a 270 Hz source, the no. of beats/sec = 12
`:.`x may be `270 -+ 12`or 282 Hz and 258 Hz.
`:.`If x = 258 Hz, then we will get 8 or 12 beast/sec
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