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Two sources of sound S1 and S2 vibrate a...

Two sources of sound `S_1 and S_2` vibrate at same frequency and are in phase. The intensity of sound detected at a point P as shown in the figure is `I_0` . (a) If theta equals `45^@`, what will be the intensity of sound detected at this point if one of the sources is switched off ? (b) What will be the answer of the previous part if `theta= 60^@` ?

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