Question

difference between ultra, infra and sonic sound

Answer 1

sound waves with frequencies higher than 20000 Hz are ultra sounds whereas ,
sound waves with frequencies lesser than 20 Hz are infra sounds

Answer 2

Ultrasound -Sound with frequency more than 20khz
Infrasonic- Sound with frequency less than 20hz
Sonic sound - If an object travels faster than the speed of sound then it is said to have super sonic speed