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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.
The electromagnetic spectrum at this site should help you out: http://www.colourtherapyhealing.com/colour/images/electromagnetic-spectrum.jpg Gamma Rays have the largest frequency and the shortest wavelength. Blue and Violet belong to visible light. Radio waves have the least amount of energy.