Question

7. Bats detect the obstacles in their path by receiving the reflected
a) Ultrasonic waves
b) Electro-magnetic waves
c) Radio waves
d) Infrasonic waves​

Answer 1

Answer. b) ultrasonic sound

Bats detect obstacles in their path by receiving the reflected Ultrasonic waves.

Answer 2

Bats detect the obstacles in their path by receiving the reflected Ultrasonic Waves.

Ultrasonic Waves are of so high frequencies which we humans can't hear.

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