Question

The particles of a medium will settle_________the rest position after a mechanical wave passes.
A.at
B.in front of
C.behind

Answer 1

After the wave passes, particles of a medium will return to their rest position (after possibly oscillating around it).

For the most part, you can think of solid mediums as very tiny springs connecting the atoms. They'll shake around when they have the energy to do so, but if you remove that energy, they'll go to their rest position, where all the forces are balanced.