If a propagating wave meets a boundary which is not completely rigid or is an interface between ...

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If a propagating wave meets a boundary which is not completely rigid or is an interface between two different elastic media, then which of the statement(s) is/are correct?
(a) A part of the incident wave is reflected and a part is transmitted into the second medium.
(b) The incident wave is completely reflected from the boundary.
(c) Only a part of the wave is reflected and the remaining part disappears.
(d) None of the above
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