In a large room, a person receives direct sound waves from a source 120 meters away from him. He also receives waves from the same source which reach him, being reflected from the 25 meter high ceiling at a point halfway between them. The two waves interfere constructively for wavelength of
Text Solution
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Let 
be source of sound and 
the person or listner.
The waves from 
reach point 
directly following the path 
and being reflected from the ceiling at point Afollowing the path 
. 
is mid-point of 
(i.e. 
and 
Path difference between waves 
We have 
= 
=130 
Path difference = SAP – SMP 
m
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