Two coherent sources of sound, 
and 
, produce sound waves of the same wavelength, 
, in phase. 
and 
are placed 
apart (see fig). A listener, located at 
, directly in front of 
finds that the intensity is at a minimum when he is 
away from 
. The listener moves away from 
, keeping his distance from 
fixed. The adjacent maximum of intensity is observed when the listener is at a distance 
from 
. Then, 
is:
Text Solution
Verified by ExpertsC
For min at (L)
(first minima)
so at ' 
' 
first maxima
for first maxima
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