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Wavelength
One convenient working definition of 'radio' is: Electromagnetic radiation withfrequency up to 300 GHz / wavelength down to 1 millimeter.'Radio' is our name for the lowest frequency / longest wavelength, so there'sno lower limit on frequency, or upper limit on wavelength.
Extra-low frequency radio waves can have wavelengths as long as 3.5 miles or more. The shortest wavelength is around 1 mm.
Wavelength = (speed) divided by (frequency) = (300,000,000) / (60,000) = 5,000 meters
The energy of infrared waves is greater than the energy of radio waves. This is because infrared waves has a smaller wavelength compared to radio waves. The smaller the wavelength, the higher the energy.