define ultrasonic waves. How it's possible that bats are able to fly at night without colliding with another object
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Ultrasound is sound waves with frequencies higher than the upper audible limit of human hearing. Ultrasound is not different from "normal" sound in its physical properties, except that humans cannot hear it. This limit varies from person to person and is approximately 20 kilohertz in healthy young adults.
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Ultrasonic waves are the waves produced by the animals which are not heard by the humans.
It is possible for the bats that they are able to fly at night without colliding with another object. It is due to they produce those ultrasonic waves during their flight. Those waves are obstructed by any other object and they get reflected to the ears of the bat and the bat can fly at night by listening the sound of those waves.