Question

which best describes what happens if two waves meet and build on each other?
constructive interference
destructive interference
reflection
absorption

Explanation:

When two waves meet and build on each other, it is called constructive interference. In constructive interference, the amplitudes of the waves add up. Destructive interference is when waves cancel each other out. Reflection is when a wave bounces off a surface. Absorption is when a wave's energy is taken in by a medium.

Answer:

Constructive interference.