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The rate of radiation of a black body at 0°C is E J/sec. The rate of radiation of this black body at 273°C will be
  • a)
    16 E
  • b)
    8 E
  • c)
    4 E
  • d)
    2 E
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
The rate of radiation of a black body at 0°C is E J/sec. The rate ...
The radiation energy emitted by a black body per unit time and per unit surface area is given by
Eb = σT4 (W/m2)
where Stefan – Boltzmann constant, σ = 5.67 × 10-8 W/m2 K4, T is absolute temperature of the surface in Kelvin.
Eb = Total emissive power of a black body
For a non-black surface having an emissivity ϵ, it follows that
Eb = ϵ σT4
Calculation:

E2 = 16 E1 = 16 E
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The rate of radiation of a black body at 0°C is E J/sec. The rate of radiation of this black body at 273°C will bea)16 Eb)8 Ec)4 Ed)2 ECorrect answer is option 'A'. Can you explain this answer?
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