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A source of unknown frequency gives 4 be...

A source of unknown frequency gives 4 beats//s, when sounded with a source of known frequency 250 Hz. The second harmonic of the source of unknown frequency gives five beats per second, when sounded with a source of frequency 513 The unknown frequency is

A

254 Hz

B

246 Hz

C

240 Hz

D

260 Hz

Text Solution

Verified by Experts

The correct Answer is:
A
`v'=250pm4=254" OR "246`
`V''=2.v' and v''=513 pm 5=518 " OR "508`
So, `508=2.(254)`
OR `v''=2.(v')`
Answer is (254 Hz).
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