What are the longest and shortest visible electromagnetic waves that humans experience?
The longest wavelength humans can see is Red and the shortest wavelength is Violet
Humans are actually considered blind, not literally but because that the visible spectrum is so small for us to see. We don't have the ability to see UV light, X - Ray, Gamma Rays, etc.
First, see that the longer the wavelength, the less energy it has and vice-versa.
So, The longest wavelength humans can see is Red and the shortest wavelength is Violet.
Hope it helps!