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Physics: Post your doubts here!

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This diagram shows how the superposition of an incident and reflected wave results in a stationary wave.
4_1.gif

The waves never have opposite displacements at the antinodes, so it can't be A.
 
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View attachment 64101

Why can't it be B or C?
Because area under Force extension graph is always the work done in stretch the wire, given no plastic deformation has occurred. If plastic deformation occurs then the area under the graph beyond yield point, is the energy used to permanently deform the wire
t
Not B because the wire is extended plastically and it will not go back to it's original lenght, so the energy is use up in misplacing the atoms in the structure of the wire

Not C because the first part of the graph where the wire extends elastically, the energy is used strechs the wire not deform it permanently thus no heat.

D is the right option
 
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