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AIIMS 2011
Exam
AIIMS
Year
2011
Subject
Physics
Chapter
Thermal Properties of Matter

AIIMS 2011 · Physics · Thermal Properties of Matter

Emissive and absorptive power of a material at 2000 ~K is 8 and 10...

Emissive and absorptive power of a material at 2000 K2000 \mathrm{~K} is 8 and 10 respectively, calculate the emissivity of IBB (Ideal black body)

Options

  1. A0.2
  2. B0.4
  3. C0.6
  4. D0.8

Correct answer

D. 0.8

Step-by-step solution

The ratio of emissive power to absorptive power is the same for all surfaces at the same temperature and is equal to the emissivity for a perfectly black body at that temperature.  i.e, ea=\text{ i.e, } \frac{e}{a}=\varepsilon Here, e=8,a=10e=8, a=10 \therefore \quad \varepsilon=ea=810=0.8\frac{e}{a}=\frac{8}{10}=0.8
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