Abstract

• Classical and quantum mechanical derivations of black hole entropy have been studied in detail in the frame work of general relativity ,thermodynamics and quantum mechanics. The black hole entropy and area have been derived from classical thermodynamics. The relationship between the classical and quantum formulas can be shown to be similar to that of black body radiation. Microstates of the black hole entropy and its physical implications have been investigated. Some applications of black hole entropy to astrophysics have also been presented.