The type of electromagnetic radiation that has the shortest frequency is the microwaves. Electromagnetic waves or radiations are types of radiations that do not require material medium for transmission. An electromagnetic spectrum arranges the electromagnetic radiations in the order of frequency size and the wavelength size. The electromagnetic radiation with the highest wavelength and the least frequency are the radio waves, while gamma rays have the lowest wavelength and the highest frequency. In this case; microwaves has the highest wavelength and the lowest frequency compared to infrared waves, Ultraviolet waves and X-rays