![]() The phase difference between the two waves decides the intensity of light meet at a point. (8)Īs a special case, if a 1 = a 2 = a, then equation (1) becomes, The energy of these electrons (i.e., their velocity once they leave the metal) does not depend on the light intensity, although the total number of electrons. Radiant intensity, a radiometric quantity measured in watts per steradian (W/sr) Luminous intensity, a photometric quantity measured in lumens per steradian (lm/sr), or candela (cd) Irradiance, a radiometric quantity, measured in watts per square meter (W/m 2). (a 1 – a 2) 2 α I 1 + I 2 – 2`sqrt("I"_1"I"_2)`. Several measures of light are commonly known as intensity. The resultant minimum intensity is I min α. ![]() ![]()
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