Question

distinguish between ultra sonic and infra sonic sound

Answer 1

Sound is only audible to the average human ear if the frequencies liebetween 20Hz and 20kHz. The actual range varies from person to person.Sound waves with frequencies less than 20Hz are called infrasonic or subsonic and those with frequencies above 20kHz are calledultrasonic.

Answer 2

Infra Sonic sound is the sound of a frequency below 20hz and ultra sonic is a sound of a frequency of more than 20,000hz or 20khz.
Hope that help^_^