2 Answers

Domkck · Answer 1 · 2017-09-23T01:07:52+0000

"Infra-" is a prefix found on several words. It's used to mean "below".

"Infrasonic" means sounds at frequencies below human hearing.

"Infrared" means electromagnetic waves at frequencies below red
light ... below human visibility.

Redrobot · Answer 2 · 2017-09-27T03:40:38+0000

Awesome question!!

Infrared radiation is something that we, as humans, are unfortunately unable to see.

Infrared radiation is the electromagnetic radiation with wavelengths longer than visible light, but shorter than radio waves

↑ ↑ ↑ Hope this helps! :D

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