MHT CET 2023 Physics question

A transverse wave strikes against a wall,

(A)its phase changes by 180° but velocity does not changeCorrect
(B)its phase does not change but velocity changes
(C)its velocity changes and phase changes by 180°
(D)nothing can be predicted about changes in its velocity and phase

Answer: (A)

Solution

A wall is a rigid (fixed) boundary, i.e. a denser medium for the wave. At a fixed end the displacement must always be zero, which requires the reflected wave to have a displacement opposite to that of the incident wave, so a phase change of ( rad) occurs on reflection. The reflected wave travels in

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Question ID VK-097830