The equation of a wave is: y = 2sin(4x-3t). What will be the equation of the reflected wave from a free surface?

The equation of a wave is: y = 2sin(4x-3t). What will be the equation of the reflected wave from a free surface? Correct Answer y = 2sin(4x+3t)

At the free surface reflected wave suffers no phase change. Only the direction of wave propagation gets reversed. So, the equation will be y = 2sin(4x+3t).
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