Question

Explain how Echoes are used by bats to judge the distance of an obstacle in front of them

Answer 1

Bats use echo in the process of echolocation
they emit ultrasound waves and if the waves get reflected and they hear them as echo
Their path has obstacles which they prevent
The ultrasound pulses are not echoed if way is clear

Answer 2

Bats search out prey and fly in dark night by emmiting and detecting reflections of ultrasonic waves. The high pitched ultrasonic squeaks of the bat are reflected from the obstacles ( prey ) and returned to bat's ear. The nature of reflections tells the bat where the obstacle (prey) is and what it is like. Porpoises also use ultrasound for navigation and location of food in the dark.