If two waves with identical crests and troughs meet, what is happening?

A. The wave is breaking.

B. The wave is reflecting.

C. Constructive interference is occurring.

D. Destructive interference is occurring.

If two waves with identical crests and troughs meet, what is happening?

C. Constructive interference is occurring.

If two waves with identical crests and troughs meet, then we know

that they have the same amplitude, frequency, and wavelength.

But we still don't know whether they are "in step" or not.

If their crests of both waves line up, then constructive interference

will occur.

If the crests of one wave line up with the troughs of the other wave,

then destructive interference will occur.