The electromagnetic radiation that has the lowest frequency is ; ( D ) Microwaves
Microwaves have a wavelength that ranges between 1 mm to 1 m and a frequency of approximately 30 GHz while the electromagnetic radiation with the highest frequency is Gamma rays , Infra red rays posses a frequency of about 3 * 10^13 Hz. therefore Microwaves posses the least frequency value
Hence we can conclude that The electromagnetic radiation that has the lowest frequency is Microwaves.
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