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An isotropic point source emits light wi...

An isotropic point source emits light with wavelength 589 nm. The radiation power of the source is P = 10 W. (a) Find the number of photons passing through unit area per second at a distance of 2 m from the source. (b) Also calculate the distance between the source and the point where the mean concentration of the photons is `100//cm^(3)`.

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