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So using the standard equation: E = hf, we can find the relationship between light intensity and wavelength as follows: c = lambda x f Therefore, f = c/lambda substitute this in the standard equation to get: E = (h c)/lambda Where h = planks constant, and c = speed of light.
(5) The name intensity, symbol I, is usually used in discussions involving collimated beams of light, as in applications of the Lambert-Beer law for spectrometric analysis. (6) Spectral quantities may also be defined with respect to frequency v, or wavelength Î»; see spectral radiant energy density above. (7) Fluence is used in photochemistry to specify the energy delivered in a given time interval (for instance by a laser pulse). This quantity may also be called radiant exposure.