The red end of the spectrum has longer wavelength and lower energy, the violet end of the spectrum has shorter wavelength and higher energy. Infra Red is also a form of light energy, but the wavelength is too long for the human eye to detect it. Infra Red can be detected by speccial photographic films and by some animals such as the pit viper. Infra Red waves have a longer wavelength than visible light and they have less energy. However, Infra Red light is absorbed by your skin and makes you feel warm.
Radio waves can be anything from a fraction of a millimetre to kilometres long.
There is some more information about radio waves in my Amateur Radio Web . Ultra Violet light is also a part of the electromagnetic spectrum. Here the waves are much shorter than visible light and there is more energy. It is the Ultra Violet UV light which gives us our sun tans or skin cancers. UV can be used to kill micro-organisms on our food.