AP EAMCET Engineering 18 Sep 2020 Shift 1 Paper

(d) When two waves of same frequency f and having same amplitude a superimpose, then resultant amplitude,
A=a+a=2a
Total intensity I of resultant wave is directly proportional to square of amplitude.
i.e., I∝A2⇒I∝(2a)2⇒I∝4a2