A wavelength is the distance between 2 successive waves (sound waves, ocean waves, or any other wave.)
Short wavelength
Infrared radiation is long wavelength radiation given out by stars.
There is no longest wavelength for photons. It can be arbitrarily long.
It depends on what you consider high frequency and long wavelength. However, as frequency increases, wavelength decreases and vice versa. In fact, frequency is inversely proportional to wavelength.
Long
I looked it up in my physics text book and it says that the wavelength is too long to be seen by the human eye.
23
The color of visible light with the longest wavelength is red; the color with the shortest is violet. So "ROY G. BIV" lists the colors from long to short wavelength. Just to confuse you, we'll also mention that it lists them from lowest to highest frequency.
How long is your co-ax???
Scattering of light
The wavelength is too long to be seen by our eyes.
Both a wave with long wavelength and a wave with short wavelength can have a lot of energy, or little energy.Specifically in the case of electromagnetic waves, a short wavelength corresponds to high energy - but this is only the energy PER PHOTON. But note that each of such waves usually consists of a lot of photons.