A metre-long tube open at one end, with a movable piston at the other end, shows resonance with a fixed frequency source (a tuning fork of frequency 340Hz ) when the tube length is 25.5cm or 79.3cm. Estimate the speed of sound in air at the temperature of the experiment. The edge effects amy be neglected.

Answer

`347 m s^(-1)`
Hint : `v_(n) = ((2n - 1)v)/(4l) ; n = 1,2,3`…… for a pipe with one end closed