NEET | 2013Sound WavesEasy
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
Options
A.260 Hz
B.254 Hz
C.246 Hz
D.240 Hz
Solution
Frequency of unknown source = 246 Hz or 254Hz Second harmonic of this source = 492Hz or 508 Hz Which gives 5 beats per second, when sounded with a source of frequency 513 Hz.Therefore unknown frequency = 254 Hz.
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