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JEE Main & Advanced Physics Transmission of Heat Question Bank Radiation Stefan's law

  • question_answer
    Temperature of a black body increases from \[{{327}^{o}}C\,\text{to}\,\text{92}{{\text{7}}^{\text{o}}}C\], the initial energy possessed is 2KJ,  what is its final energy                                               [DCE 2001]

    A)            32 KJ                                        

    B)            320 KJ

    C)            1200 KJ                                   

    D)            None of these

    Correct Answer: A

    Solution :

                       \[\frac{{{Q}_{2}}}{{{Q}_{1}}}={{\left( \frac{{{T}_{2}}}{{{T}_{1}}} \right)}^{4}}={{\left( \frac{273+927}{273+327} \right)}^{4}}={{\left( \frac{1200}{600} \right)}^{4}}=16\] Þ Q2­ \[=32\ KJ\]


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