General Knowledge - Physics - Discussion

Infrasonic : sound frequency less than 20HZ.
Ultrasonic : sound frequency greater than 20kHz.
Supersonic : it is not the frequency range it denotes the speed of objects which have speed greater then the speed of sound i.e. 330m/s. It produces shock waves.

Can someone explain it in depth?

You are right. I agree @Cm Prasad.

Because less than or equal to 20 Hz man can not hear the sound.

Man can hear between 20 Hz and 20000 Hz.

Which frequency makes man's ear dum?

@Tracy.

20HZ - 20000HZ(sometimes 16000 HZ).

How much HZ is needed for a human being?

Because man cannot hear sound less than 20 Hz.

The human beings cannot listen to the sound which is below 20Hz. Only some type of animals can hear it like bat's.

@Nishtha you are wrong.

Infrasonic - frequency less than 20 hz (can not be hear).

Visible light - frequency 20 hz to 20, 000 hz (can be hear).

Ultrasonic - more than 20, 000 (can not be hear).

NOTE - all three forms relate with frequency but supersonic not.

Supersonic relates with velocity.

Hence supersonic - the sound wave having speed more than 332 meter/second (velocity of sound in air).

Supersonic jet planes named on property because they have speed more than 332 m/s.