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: Option D
Explanation
(lambda) = 4(L + C) ; where C = o
(lambda) = 4 x 20 = 80cm
V = (lambda)F
= 80 x 10-2 x 480 = 384ms-1