The order of lowest energy to highest energy of electromagnetic radiations is radio, infrared, visible light, ultraviolet, X rays, gamma rays.
The electromagnetic spectrum consists of all the electromagnetic radiations distributed by their frequency and wavelength. Every electromagnetic radiation travel at the speed of light but with different energy, frequency and wavelength.
The gamma rays have the highest energy and frequency but lowest wavelength followed by X-rays, ultraviolent rays, visible light, infrared, and radio waves.
Radio waves have travel the longest because they have the highest wavelength. The frequencies and wavelengths of electromagnetic radiation can also be used for spectroscopy.
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