Question

An iron ball having a surface area of $200 \mathrm{~cm}^2$ and at a temperature of $527^{\circ} \mathrm{C}$ is placed in an enclosure at $27^{\circ} \mathrm{C}$. If the surface emissivity of iron be $0.4,$ at what rate is heat being lost by radiation by the ball?

Accepted Answer

$45.59 \mathrm{~cal} \mathrm{~s}^{-1}$

Answer

$46.59 \mathrm{~cal} \mathrm{~s}^{-1}$

Answer

$47.59 \mathrm{~cal} \mathrm{~s}^{-1}$

Answer

$48.59 \mathrm{~cal} \mathrm{~s}^{-1}$

JEE PHYSICS MCQ: THERMAL PROPERTIES OF MATTER

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