<span>A. frustration-aggression theory.
Good Luck!!</span>
Explanation:
Lasers produce a narrow beam of light in which all of the light waves have very similar wavelengths. The laser's light waves travel together with their peaks all lined up, or in phase. This is why laser beams are very narrow, very bright, and can be focused into a very tiny spot.
Answer:
It should be A. Disturbance that travels through a medium or space, transmitting energy from one point to another.
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