Question

Amit uses a device to keep dogs away from his garden.The device emits

ultrasound waves that dogs do not like.

Amit has good hearing but he cannot hear the ultrasound waves from the device

however, dogs can hear them. Explain this difference.
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Answer 1

Answer:

The sound waves having frequency higher than 20,000 Hz is

called ultrasonic waves. Human beings can"t hear Ultra sound. Bats and dolphins detect the presence of any obstacle by

hearing the echo of the sound produced by them.