In a resonance tube experiment, a tube open at one end and closed by a movable piston at the other s

Question

In a resonance tube experiment, a tube open at one end and closed by a movable piston at the other shows resonance with a 340 Hz tuning fork at tube lengths of 25.5 cm and 79.3 cm. Estimate the speed of sound in air.

Professor PC Thomas Classes · Answer

The speed of sound $v = 2f(L_2 - L_1) = 2 	imes 340 	imes (0.793 - 0.255) = 680 	imes 0.538 = 365.8$ m/s $\approx$ 366 m/s.