Figure I represents schematically the different regions of the spectrum of electromagnetic waves, corresponding to the different regions of wavelength λ and frequency ν. These two quantities are related by
where c=velocity of light in vacuum=2.999 × 108m/s. Electromagnetic waves carry energy, which may be absorbed by matter, producing different effects. This absorption can occur only in multiples of a quantum of energy, proportional to the frequency of the radiaiton; thus for radiation of frequency ν, the value of the quantum is:
$$c = \nu \lambda $$
where h=6.6 × 10-34J.s is the Plank constant. A quantum of radiant energy is also called a photon
$$h\nu = hc/\lambda $$
KeywordsDioxide Convection Mercury Platinum Recombination
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© D. Reidel Publishing Company 1980