A one metre long (both ends open) organ pipe is kept in a gas that has double the density of air at STP. Assuming the speed of sound in air at STP is , the frequency difference between the fundamental and second harmonic of this pipe is ________Hz.
A wire of length L and mass per unit length is put under tension of 540 N. Two consecutive frequencies that it resonates at are : 420 Hz and 490 Hz . Then L in meters is :
A stationary observer receives sound from two identical tuning forks, one of which approaches and the other one recedes with the same speed (much less than the speed of saund. The observer hears 2 beats/ sec. The oscillation frequency of each tuning fork is and the velocity of sound in air is . The speed of each tuning fork is close to: