If a crest and a trough in a ripple tank meet, what happens?

A) Constructive interference occurs.

B) Nothing happens.

C) They cancel each other out.

D) They add up to form a larger trough.

Constructive interference occurs

Explanation:

When the crests or troughs of two interfering waves meet, their amplitudes add together. This principle is known as constructive interference. So, what happens when the crest of one wave meets the trough of another wave? Well, the opposite happens, and it's called destructive interference. When the crest and trough of two interfering waves meet, one amplitude subtracts from the other.

second mirror gathers light from a faraway object and reflects it to another mirror. - a.

c. 7/3

step-by-step explanation:

a rational number is like pi- it is a repeating decimal.

a. is -1.8

b. 2.236068

c. 2.3333333333333333333

d.   is 3

i hope that ! =)