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NEET 2009
Exam
NEET
Year
2009
Subject
Physics
Chapter
Thermal Properties of Matter

NEET 2009 · Physics · Thermal Properties of Matter

A black body at 227^ C radiates heat at the rate of 7 cals / cm^2...

A black body at 227∘C227^{\circ} \mathrm{C} radiates heat at the rate of 7cals/cm2 s7 \mathrm{cals} / \mathrm{cm}^2 \mathrm{~s}. At a temperature of 727∘C727^{\circ} \mathrm{C}, the rate of heat radiated in the same units will be :

Options

  1. A80
  2. B60
  3. C50
  4. D112

Correct answer

D. 112

Step-by-step solution

\mathrm{P} \propto \mathrm{T}^4 P2P1=(1000500)4P2=16P1=112\begin{aligned}& \frac{\mathrm{P}_2}{\mathrm{P}_1}=\left(\frac{1000}{500}\right)^4 \\ & \mathrm{P}_{2}=16 \mathrm{P}_{1}=112 \end{aligned}
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