SATHEE: Thermal Properties of Matter

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) $(1000)^{2}$

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

[2007]

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Answer:

Correct Answer: 29. (a)

Solution:

(a) According to Stefan’s law,

$E \propto T^{4}$

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

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

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

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Thermal Properties of Matter - Result Question 28

29. A black body is at 727∘C. It emits energy at a rate which is proportional to

Answer:

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