General Knowledge - Physics - Discussion

@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.

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.

Infrasonic wave- Below 20hz frequency (Dogs can listen it).
Audible sound-. 20 to 20000 Hz Human can listen only of this frequency range sound.
Ultrasonic-beyond 20000 Hz (man cannot listen to it but bats can listen to these sounds).

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)

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

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

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

Man can hear between 20 Hz and 20000 Hz.

Scholars, how then can humans prevent the biological effects that may be induced by supersonic?

If we produce a sound more than 20mhz, can we feel noise or we will not listen totally?

Can a snake listen the sound of frequency below 20 HZs sitting on a tree?