In a Hall, a person receives direct sound waves from a source 120m away. He also receives wave from the same source which reach him after being reflected from the 25m high ceiling at a point half way between them. The two waves interfere constructively for wave length (in meters).
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Verified by ExpertsThe correct answer is:
A
Path difference ( Δ S) between direct and reflected wave = 130 – 120 = 10 m
for so constructive interference Δ S = n λ λ
λ λ = 
(n = 1, 2, 3, .......)
λ λ = 10, 
.....
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