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Solution :

The wavelength of sound wave is `lamda=u/v` <br> `=(332ms^-1)/(1.0xx10^3Hz)=0.332m`. <br> The phase difference the waves arriving at the point of observation is <br> `delta=(2pi)/lamda /_\x=2pixx(0.83m)/(0.332m)=2pixx2.5=5pi`. <br> As this is an odd multiple of pi the waves interfers destructively.