G L Mittal and TARUN MITTAL Solutions for Chapter: Thermal Radiation, Exercise 1: QUESTIONS

What do understand by radiant energy? Compare its properties with the properties of light

What is meant by emissive power and absorptive power? Describe an experiment to show that good absorbers are good emitter and bad absorbers are bad emitters.

Prove that for wavelength $\lambda$, at a definite temperature, the ratio of emissive power $e_{\mathrm{\lambda }}$ to the absorptive power $a_{\mathrm{\lambda }}$ of all the bodies is equal to the emissive power  $E_{\mathrm{\lambda }}$ Of the perfectly black body at that temperature.

State Kirchhoff's law of radiation and prove it.

State Stefan's law of thermal radiation. Established Newton's law of cooling from this law.

Define solar constant. How does one estimate the surface temperature of the sun?

Define a perfectly black body. Draw the spectral distribution curve of the black body and write the effect of rising of temperature on it.