Question

what happens to the wave energy as it moves through the medium? *
the energy increases because the wave gains more motion
the energy stays the same as long as the wave keeps moving
the energy spreads out and can decrease as it transfers energy to the medium
the energy disappears once the wave leaves the source

Explanation:

When a wave travels through a medium, some of its energy is transferred to the medium (for example, through friction or vibration of the medium's particles), causing the wave's energy to spread out and decrease over distance. Energy cannot be created (so it does not increase) or destroyed (so it does not disappear entirely), and it does not stay constant as energy is lost to the medium.

Answer:

C. The energy spreads out and can decrease as it transfers energy to the medium