A source of unknown frequency gives 4 beats s when sounded

Last updated: 6/14/2023

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 NEET 2013 1 246 Hz 3 260 Hz 2 240 Hz 4 254 Hz