An isotropic point source emits light with wavelength = 589 nm. The radiation power of the source is P =
(a) The mean density of the flow of photons at a distance r = 2.0 m from the source;
(b) The distance between the source and the point at which the mean concentration of photons is equal to r =100 cm–3.
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Question Posted: August 24, 2010 03:09:25