(a) State Kirchhoff's law of thermal radiation. (b) Using this law, explain in one or…
PHYSICS · Subjective · CBSE · Physics · Thermal Properties of Matter · Thermal Properties of Matter
Problem
(a) State Kirchhoff's law of thermal radiation.
(b) Using this law, explain in one or two sentences why a body that absorbs radiation strongly at a particular wavelength also emits strongly at that wavelength.
(c) What is the emissivity of a perfect absorber?