Question

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 hz. the unknown frequency is. a) 254 hz b) 246 hz c) 240 hz d) 260 hz

Answer 1

The unknown frequency is 254 Hz.

Explanation:

• Let v be frequency of the unknown source.
• As it gives 4 beats per second when sounded with a source of frequency 250 Hz.
• Second harmonic of this unknown source = 492 Hz or 508 Hz which gives 5 beats per second.
• When sounded with a source of frequency 5 13 Hz.

Therefore unknown frequency, v - 254 Hz.

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