Answer :

Given:
Resultant intensity at P =
I0



The two sources of sound S1 and S2 vibrate with the same frequency and are in the same phase.



(a) When
θ = 45°:
Path difference =
S1P − S2P = 0


So, when the source is switched off, the intensity of sound at P is


Capture.PNG


(b) When the path difference is also. Similarly, it can be proved that the intensity at P is


When the source is switched off.


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