Electromagnetic Waves have different wavelengths.
Waves in the electromagnetic spectrum vary in size from
very long radio waves the size of buildings, to
very short gamma-rays smaller than the size of
the nucleus of an atom.
Did you know that electromagnetic waves can not only be described by their wavelength, but also by their energy and frequency? All three of these things are related to each other mathematically. This means that it is correct to talk about the energy of an X-ray or the wavelength of a microwave or the frequency of a radio wave.
The electromagnetic spectrum includes, from longest wavelength to shortest: radio waves, microwaves, infrared, optical, ultraviolet, X-rays, and gamma-rays.
To tour the electromagnetic spectrum, follow the links below!