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JEE Main & Advanced Physics Thermometry, Calorimetry & Thermal Expansion Question Bank Self Evaluation Test - Thermal Properties of Matter

  • question_answer
    A black body is at \[727{}^\circ \,C\]. It emits energy at a rate which is proportional to

    A) \[{{(1000)}^{4}}(b)\]   

    B)        \[{{(727)}^{2}}\]

    C) \[727{{)}^{4}}\]         

    D)        \[{{(727)}^{2}}\]

    Correct Answer: A

    Solution :

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


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