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The effective temperature of a body having an area of 0.12 m2 is 527°C. Calculate the following : 

(i) The total rate of energy emission. 

(ii) The intensity of normal radiation, and 

(iii) The wavelength of maximum monochromatic emissive power

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Given : A = 0.12 m2 ; T = 527 + 273 = 800 K 

(i) The total rate of energy emission, Eb

Eb = σ AT4 W (watts) ...

= 5.67 × 10–8 × 0.12 × (800)4 = 5.67 × 0.12 × \(\left(\cfrac{800}{100}\right)^4\) = 2786.9 W.

(ii) The intensity of normal radiation, Ibn :

Ibn = Eb/π , where Eb is in W/m2 K4

(iii) The wavelength of maximum monochromatic emissive power, λmax

From Wien’s displacement law,

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