A sound source emits two sinusoidal sound waves, both of wavelength `lambda`, 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, producing minimum intensity at that point.The minimum value of d in terms of `lambda` is : A. `lambda/8`B. `lambda/4`C. `(3lambda)/8`D. `lambda/2`

A sound source emits two sinusoidal sound waves, both of wavelength `l

1.	A sound source emits two sinusoidal sound waves, both of wavelength `lambda`, 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, producing minimum intensity at that point.The minimum value of d in terms of `lambda` is : A. `lambda/8`B. `lambda/4`C. `(3lambda)/8`D. `lambda/2`
Answer» Path difference = Path B-Path A =7d-3d=4d [Note that there is no phase change in reflections from mirror in case of sound] For being out of phase : `Deltax=4d=lambda/2 , (3lambda)/2`,.... For minimum d, `4d=lambda/2` `rArr d=lambda/8`

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