Question

State three application of echoes

Answer 1

1. Sonar
2. Megaphone
3.Hearing aid

Answer 2

Echo depends on reflection of a wave.

Three applications that depend on a reflected wave are:

1. a policeman's radar gun determines the speed of a vehicle by using the time difference between sending a signal and reception of the reflected wave.

2. a speed gun used to measure the speed of a pitched baseball works in a similar way.

3. a weather station can determine the rotational speed of a storm by the time differences of reflected radar waves from opposite sides from the center of rotation of the storm.