A travelling wave ` y = A sin (k x - omega t + theta)` passes from a heavier string to a lighter string . The juction of the strings is at ` x = 0`. The equation of the reflected wave is

Options

A. `y' = 0.5 A sin ( kx + omega t + theta)`
B. `y' = - 0.5 A sin ( kx + omega t + theta)`
C. `y' = - 0.5 A sin ( kx - omega t - theta)`
D. `y' = - 0.5 A sin ( kx + omega t - theta)`

Answer

A

Explanation

As wave has been reflected from a rare medium , therefore there is no change in phase , but starts travelling in `- x` direction .