General Knowledge - Physics - Discussion

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

Man can hear between 20 Hz and 20000 Hz.

Infrasonic : less than 20Hz (can not be heard by humans)
Ultrasonic : between 20Hz and 20kHz (can be heard by humans)
Supersonic : more than 20kHz (can not be heard by humans)

Good nithish.

Thanks nishtha.

Is ultrasonic and audio frequency same terms?

Infrasonic. The relevance of this particular frequency is that it is the lower limit of hearing the normal people.

@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.

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

Because man cannot hear sound less than 20 Hz.

How much HZ is needed for a human being?