Question

State the use of echo by a bat, dolphin and fisherman.

Answer 1

Bats produce sound which has the ability to echo back to them when it hits an obstacle.

This makes them understand where the obstacle is, and helps them to find their way by avoiding that obstacle.

• The dolphin can detect their enemies by emitting ultrasonic waves. They use it to trap their prey.

• The fishermen send ultrasonic waves from some source. The reason being that these waves will strike an obstacle or a school of fish.

When it does, they easily trap the fish.