Module 5 : MODERN PHYSICS
Lecture 23 : Black Body Radiation
  is known as Stefan's constant.
  For a body with emissivity (the ratio of radiation emitted by a body to that predicted by PLanck's law for an ideal black body) $ e$, the power radiated from a unit area of the surface is
 
$\displaystyle \sigma e T^4$
  In addition to emitting radiation, a body at temperature $ T$ also absorbs radiation. If the surrounding temperature is $ T_0$, the power absorbed per unit surface area is
 
$\displaystyle \sigma e (T^4-T_0^4)$
  Example-2
  Example-3
  Exercise 5
 

Exercise 6

 
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