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Unformatted text preview: mm 10-3 Infrared Centimeter cm 10-2 Microwa Meter m 1 TV, radio The range of EM wavelengths is dramatic The wavelengths of gamma-rays (<0.1 ) are similar to the diameter of atomic nuclei The wavelengths of some radio waves can be larger than a football field Frequency Frequency is expressed in cycles per second , also known as hertz ( Hz ) Usually the dimension 'cycles' is omitted and frequencies thus have the dimension of s-1 Sodium vapor lamps are sometimes used for public lighting. They give off a yellowish light with a wavelength of 589 nm. What is the frequency of this radiation? frequency*wavelength = speed of light frequency = speed of light/wavelength = (3.00x10 8 m/s)/(589x10-9 m) = 5.09 x 10 14 s-1 = 5.09 x 10 14 cycles per second or 5.09 x 10 14 hertz...
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- Fall '10