What happens to light when it hits a medium like wood or metal?

When light hits a medium such as wood or metal, it can be absorbed by the material, leading to the release of light energy as heat. This phenomenon occurs because the electromagnetic energy from the light interacts with the atoms and molecules in the medium. The energy excites these particles, causing them to vibrate more intensely, which we perceive as an increase in thermal energy or heat.

In the context of the other options, while light can be refracted or scattered when it encounters certain materials, wood and metal typically absorb a significant portion of the incoming light. Additionally, while transmission is a characteristic of many transparent materials, wood and metal are generally not transparent and do not allow light to pass through without change. Thus, the interaction of light with wood and metal chiefly results in the conversion of light energy into thermal energy, validating the correctness of the answer.