electromagnetic radiation


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Energy that travels through space at the speed of light. The total range of electromagnetic

wavelengths and frequencies is called the electromagnetic spectrum. Radio waves have the lowest energies and longest wavelengths of all types of electromagnetic radiation. X-rays and gamma-rays have the highest energies and shortest wavelengths, about the size of atoms. Wavelengths of light are measured in microns, millionths of meters. For all forms of electromagnetic radiation, the speed of light must remain constant, regardless of wavelength or frequency.