An incident wave is given as y = a.sin(kx - ωt) and it is reflected by a non-rigid boundary. If no energy is dissipated, then the reflected wave is given by:

1
a.sin(kx - ωt)
2
a.sin(kx - ωt + π)
3
a.sin(kx - ωt - π)
4
None of these

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