Stefan-boltzmann Law of Radiation

State and explain Stefan's law of radiation.

Define Boltzmann constant.

Calculate the energy radiated in one minute by a blackbody of surface area 100 cm² when it is maintained at 227°C. (Given: σ = 5.67 × 10⁻⁸ W/m².K⁴)

An ideal gas has pressure 'p' volume 'V' and absolute temperature 'T'. If 'm' is the mass of each molecules and 'K' is the Boltzmann constant, then density of the gas is ______.

A small blackened solid copper sphere of radius 2.5 cm is placed in an evacuated chamber. The temperature of the chamber is maintained at 100 °C. At what rate must energy be supplied to the copper sphere to maintain its temperature at 110 °C? (Take Stefan’s constant σ to be 5.67 × 10^-8 J s^-1 m^-2 K^-4) and treat the sphere as a blackbody.)

Compare the rate of loss of heat from a metal sphere at 827°C with the rate of loss of heat from the same at 427°C, if the temperature of the surrounding is 27°C.

State the Stefan-Boltzmann law.

At 273°C, the emissive power of a perfectly black body is R. What is its value at 0°C?