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Sound Waves: Resonance MCQ

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ResonanceMediumQuestion 31246

Question

A resonance column experiment (closed pipe). Resonance lengths at fundamental and 3rd harmonic: L₁ and L₂. Speed of sound is:
  1. A
    4fL₁
  2. B
    2f(L₂−L₁)
    Correct
  3. C
    f(L₂−L₁)
  4. D
    4f(L₂−L₁)

Correct answer

2f(L₂−L₁)

Explanation

L₁ = λ/4, L₂ = 3λ/4. L₂ − L₁ = λ/2. v = fλ = 2f(L₂−L₁).

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