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MDCAT Physics QUESTION #4383
Question 1
If two speakers emit sound at the same frequency and phase, maximum loudness occurs when:
  • Path difference $= \dfrac{\lambda}{2}$
  • Path difference $= \lambda$✔️
  • Path difference $= \dfrac{\lambda}{4}$
  • Path difference $= \dfrac{3\lambda}{4}$
Correct Answer Explanation
Maximum loudness (constructive interference) occurs when the path difference is a whole number multiple of wavelength: $\Delta x = n\lambda$ where $n = 0, 1, 2, ...$. For $n=1$, path difference $= \lambda$.