Question

A progressive wave y=A sin (kx-wt) is reflected by a rigid wall at x=0. Then the reflected can be represented by?
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Answer 1

Answer:

I hope it is understandable

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Answer 2

Answer:

y = A sin (k x + ω t)

Explanation:

given,

progressive wave

y =A sin ( k x- ω t)

when the wave is reflected back from the wall the phase difference will be equal to π

and the displacement will be taken as -x

now,

y =A sin ( ( k (-x) - ω t) + π)

sin (π + θ ) = - sin θ

In third quadrant sin value have negative sign.

y = - A sin ( - k x - ω t)

sin(-θ ) = - sin θ

y = A sin (k x + ω t)