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In a resonance tube experiment, the effective length of the air column for the first...

Physics
JAMB 1990
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
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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
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