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.

here we know that ball will drop down by total distance 3.2 m

so here we know that

now using kinematics

now in the same time it will cover horizontal distance of 0.75 m

so speed of the ball will be

so easy. just google the electromagnetic waves and it’ll pop up.