1. Distinguish between constructive and destructive interference. Please use 3 content related

sentences. ref: p.394-399)

Constructive interference is when a crest interferes a crest or trough interferes a trough, it results in a larger crest or trough while

Destructive interference is when a crest interferes a trough or a crest interferes a trough, it results in cancellation and it produces a smaller disturbance

In constructive interference the displacement of the waves interfere in same directions. While

In destructive interference the displacement of the waves interfere in opposite directions

In constructive interference the amplitude of the resultant waves at a given position or time is greater than that of either individual waves. While

In destructive interference the amplitude of the resultant waves is less than that of either individual waves.

sonar - device which is used to find the submit submarines, sankalp ship. sonar waves consists of a transmitter and detector which are installed in the observation centre on board of a ship. the ultrasonic waves are sent into the sea at high frequency about 1000 khz in all direction.