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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.
The intensity varies with the distance from the source and the power of the source. Power is a property of the light source that describes the rate at which light energy is emitted by the source. Power is often expressed in units of watts.Table 1 shows the dependence of intensity (I) upon the distance (r) from a 60-watt light bulb.Numbers are rounded to the second decimal place. 1996-2012 The Physics Classroom, All rights reserved. Light Intensity The term intensity is used to describe the rate at which light spreads over a surface of a given area some distance from a source.