WAEC - Physics (2017 - No. 24)
The diagram above illustrates two waves of equal amplitudes A and frequencies approaching each other. When the two waves meet at a point I midway between them, the vertical displacement of the resulting wave will be
0
\(\frac{A}{2}\)
\(\frac{A}{4}\)
\(2A\)
Explication
This is a type of constructive interference. When two waves of equal amplitude are interfering constructively, the resulting amplitude is twice as large as the amplitude of an individual wave.
= A + A = 2A