Question

The equation of a plane progressive wave is y = 0.9 sin 4π[t - x/2]. When it is reflected at a rigid support, its amplitude becomes 2/3  of its previous value. The equation of the reflected wave is

Answer 1

Correct option: (b) 

Explanation: 

Amplitude of reflected wave = 2/3 x 0.9 = 0.6

It would travel along negative direction of x-axis, and on reflection at a rigid support, there occurs a phase change of π.