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The equation of a plane wave travelling ...

The equation of a plane wave travelling along positive direction of `x-`axis is `y = asin"(2pi)/(lambda)(vt-x)` When the wave is reflected at a rigid surface and its amplitude becomes `80%`, then find the equation of the reflected wave.

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The correct Answer is:
` y^' =0.8 a sin (2pi)/(lambda)(vt+x+(lambda)/2)`
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