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:
- (a) According to Stefan’s law,
$E \propto T^{4}$
$E \propto(t+273)^{4} K[727^{\circ} C=(727+273) K]$
$E \propto(727+273)^{4} K$
$E \propto(1000)^{4} K$
