A sound source emits two sinusoidal sound waves, both of wavelength X, along paths A and B as shown in figure. The sound travelling along path B is reflected from five surfaces as shown and then merges at point Q exactly out of phase with the sound that travelled along path A. The minimum value of d in terms of λ λ is:
Text Solution
Verified by ExpertsThe correct answer is:
A
Path difference = Path B - Path A = 7d-3d =4d For being out of phase
Δ Δ x = 4d = 
;................
For minimum d, 4d = 
⇒ ⇒ d = 
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