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In a resonance tube experiment, the effective length of t...

In a resonance tube experiment, the effective length of the air column for the first resonance is 20cm when set into vibration by a tuning fork of frequency 480Hz. Neglecting and effect, the velocity of sound in air is

A.

96ms-1

B.

255ms-1

C.

340ms-1

D.

384ms-1

Correct answer is D

λ = 4(L + C) ; where C = o

λ = 4 x 20 = 80cm

V = λF

= 80 x 10-2 x 480 = 384ms-1