Two open organ pipes 80 and 81 cm long found to give 26 beats in 10 sec, when each is sounding its fundamental note. Find the velocity of sound in air.

Explanation

Number of beats per second
`=(26)/(10)=(V)/(160)-(V)/(160) rArr 2.6= (2V)/(160xx162)`
`rArr V=(2.6xx160xx162)/(2)=33696 cm s^(-1) -=337ms^(-1)`