A source of unknown frequency gives 4 beat'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

Question

A source of unknown frequency gives 4 beat'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) 260 Hz (B) 254 Hz (C) 246 Hz (D) 240 Hz

Tardigrade Admin · Accepted Answer

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

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

260 Hz

254 Hz

246 Hz

240 Hz

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

Q. A source of unknown frequency gives $4 b e a t^{'} s$ , 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

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