Question
What are infrasonic and ultrasonic waves? Give examples.
Solution
Infrasonic waves: If the frequency of the waves is less than 20 Hz then the waves are called infrasonic waves. Infrasonic waves are produced by large vibrating bodies.
The waves produced before the actual shockwaves during an earthquake is infrasonic waves. Animals ike whales and elephants produce infrasonic waves. Human beings cannot hear these waves.
Ultrasonic waves: When the frequency of the waves is greater than 20,000 Hz they are called ultrasonuic waves.
Bats, dogs, rats, cats, birds and insects can produce and also hear these waves.
