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NEET2019PhysicsThermal Properties of MatterActual

Calculate radiation power for sphere whose temperature is 227^ C , radius 2 ~m and emissivity 0.8 .

Options

  1. A1425 ~W
  2. B1500 ~W
  3. C1255 ~W
  4. D1575 ~W

Correct answer

A. 1425 ~W

Step-by-step solution

Given, T=227^ C , r=2 ~m , e=0.8 Radiation power, P= AeT ^4 aligned & =5.67 10⁻⁸ 4 (2)^2 0.8 (227+273)^4 & 1425 ~W aligned

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