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A tunning fork of frequency 480 H z is used in an experiment for measuring speed of sound v in air by resonance tube method. Resonance is observed to occur at two successive lengths of the air column, l 1 = 30   c m and l 2 = 70    c m . Then, ν is equal to:

Options

  1. A384 m s - 1
  2. B332 m s - 1
  3. C338 m s - 1
  4. D379 m s - 1

Correct answer

A. 384 m s - 1

Step-by-step solution

Speed of sound, v = 2 f l 2 - l 1 = 2 × 480 0.70 - 0.30 = 384 m / s

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