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Which of the following are properties of mechanical waves? check all that apply ⭕️ particles of the medium move back and fourth, but do not move with the wave. ⭕️ the particles of the medium always move parallel to the wave motion. ⭕️ wave motion begins with a disturbance in the medium. ⭕️ waves transport energy from a source outward, away from the source.

If two parallel light rays hit a mirror, they will not be parallel to each other after they reflect.

Ryan is examining the energy of the particles in a bar of gold. what is ryan most likely studying?