Properties Of Solids And Liquids Question 462

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

Options:

A) $ {{(1000)}^{4}}(b) $

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

C) $ 727{{)}^{4}} $

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

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Answer:

Correct Answer: A

Solution:

[a] According to Stefan’s law, $ E\propto T^{4} $

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

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

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



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