In a ball, a person receives direct sound waves from a source 120 m away. He also receives waves from the same source which reaches him after being reflected from the 25 m high ceiling at a point halfway between them. The two wave interfere constructively for wavelengths (in m)
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
B
Path covered by 1 st wave, 
Path covered by 2 nd wave, 
Path difference, 
For constructive interference, 
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