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  • The emissive power of a black body at. Consi

The emissive power of a black body atT = 300 K\; is \;100 W/m^{2}. Consider a body B of area A = 10 m^{2}, coefficient of reflectivity r = 0.3 and absorptivity a = 0.2. If its temperature is 300 K, then markout the correct statement.

Option: 1

The emissive power of B is 20 W/m2


Option: 2

The emissive power of B is 200 W/m2


Option: 3

The power emitted by B is 20 W


Option: 4

The power emitted by B is 180 W


Answers (1)

best_answer

Answer (1)

For a body emissivity = absorptivity = 0.2

\frac{E_b}{a_b}=\frac{E_B}{a_B}\\\frac{100}{1}=\frac{E_B}{a_B}\\ \\ \Rightarrow E_B=0.2 \times 100\\ \\=20\;W/m^{2}

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shivangi.bhatnagar

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