Energy

Newton’s law of cooling states that the rate of cooling of a body is directly proportional to the temperature difference between the body and the…

Stefan’s law states that the total amount of heat energy radiated per second per unit area of a perfect black body is directly proportional to…

Wien’s displacement law states that the wavelength of the radiation corresponding to the maximum energy (λm) decreases as the temperature T of the body increases.…

Kirchhoff’s Laws are applications of two fundamental conservation laws: the Law of Conservation of Energy, and the Law of Conservation of Charge. (i) The silvered…

According to Kirchoff’s Law, the ratio of emissive power to the absorptive power corresponding to a particular wavelength and at a given temperature is always…

Prevost applied the idea of thermal equilibrium to radiation. According to him, the rate at which a body radiates or absorbs heat depends on the…

Fery’s black body consists of a double walled hollow sphere having a small opening O on one side and a conical projection P just opposite…

A perfect black body is the one which absorbs completely heat radiations of all wavelengths which fall on it and emits heat radiations of all…

The emissive power of a body at a given temperature is the amount of energy emitted per unit time per unit area of the surface…

Absorptive power of a body for a given wavelength and temperature is defined as the ratio of the radiant energy absorbed per unit area per…