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Waves – Some numerical Problems and doubts

1a) two tunning forks when soundedtogether produce 3 beats per second on loading one of them with a little wax 20 beats are heard per second.find its frequency if that of other is 386 Hz.
1 b) calculate velocity of sound in a gas in which two wave length 2.04m produce 20 beat in 6 second.
1 c)a string 1m long with mass 0.1 gm/cm is under aa tension of 400 N find its fundamental frequency.
1d)a steel rod 100 cm long is clamped at middle of it.fundamental frequency of longitudinal vibration of the rod is given to be 2.53kHz.what is speed of sound in steel

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