Electromagnetic Spectrum

The electromagnetic spectrum describes the range of electromagnetic waves placed in order of increasing frequency.  At one end of the spectrum are radio waves, which have a very low frequency and long wavelengths.  At the other end of the spectrum are high-frequency, short wavelength gamma rays.  All electromagnetic waves travel at the same speed--the speed of light.  They differ in the amount of energy they transfer, called electromagnetic radiation. Lower-frequency waves like radio waves emit less electromagnetic radiation than do higher-frequency rays like gamma rays.