Two sound waves of relative intensities 400 : 1 show interference. The ratio of intensity at the maxima to minima is close to

I∝a2At maxima a′=a1+a2At maxima a′′=a1−a2Given that relative intensities are 400 : 1 r'.e., amplitudes arc in the ratio 20 : 1Ratio of intensity at maxima =(20+1)2(20−1)2=(21)2(19)2≈119