Answer to Question #98757 in Physical Chemistry for Abhishek

Question

Distinguish between fluorescence and phosphorescence .

Answer 1

Fluorescence is the emission of light by a substance that has absorbed light or other electromagnetic radiation.  Unlike fluorescence, a phosphorescent material does not immediately re-emit the radiation it absorbs, thе absorbed radiation is re-emitted at a lower intensity for up to several hours after the original excitation.