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Low frequency waves have a very long wavelength. Radio waves are  the waves with the lowest frequency, also known as electromagnetic  radiation.  +++  Muddled, because theâ¦ question does not state in which context.
Gamma rays have the shortest wavelengths of the electromagnetic spectrum, and the highest energies. Gamma rays have such short wavelengths, that astronomers usually discuss them in terms of energy. Gamma rays have energies greater than about 100 keV (keV stands for kilo-electron volt. There are 1000 eV in 1 keV).