Information on the infrasonic and ultrasonic sounds
Answers
#BAL
They each denote the opposite end of the frequency range used by humans - kind of like Left and Right.
Ultrasound is anything above about 20 KHz, and Infrasound is anything below 20 Hz.
So Ultrasound is very high frequency, tends to travel in a straight line under some circumstances, making it useful for sonar-like applications, and bounces off most solid objects.
Infrasound, on the other hand, is very low wavelength and tends to penetrate matter quite effectively, and can even be caused by (and can cause) seismic waves.
But the most important thing to remember is “Sound” is from 20Hz to 20 KHz. Infra means “Below” so sounds below this are automatically Infrasound. Ultra means “Above” so sounds above 20 KHz are Ultrasound. Within both Infrasound and Ultrasound, you’ll find a range of unusual and interesting properties that varies entirely with the frequency.