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State Stefan' s law. |
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Answer» According to this law, the amount of heat radiations' emitted per unit time from a unit area of a body at absolute temperature T is directly proprotional to the fourth power of the temperature. i.e., E ∝ T4 or E = σT4 where σ is a constant of proprotionality and is called Stefan's constant. Its value is = 5.67 X 10-8 J s-1 m-2 K-4 or Wm-2 K-4 in S. I. |
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