Thermal Properties of Matter - Result Question 28

29. A black body is at $727^{\circ} C$. It emits energy at a rate which is proportional to

(a) $(1000)^{4}$

(b) $(1000)^{2}$

(c) 727$)^{4}$

(d) $(727)^{2}$

[2007]

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Answer:

Correct Answer: 29. (a)

Solution:

  1. (a) According to Stefan’s law,

$E \propto T^{4}$

$E \propto(t+273)^{4} K[727^{\circ} C=(727+273) K]$

$E \propto(727+273)^{4} K$

$E \propto(1000)^{4} K$



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