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JAMIA MILLIA ISLAMIA Jamia Millia Islamia Solved Paper-2012

  • question_answer
        The temperature of the black body increases from T to 2T. The factor by which the rate of emission will increase, is?

    A)  4                                            

    B)  2    

    C)  16                                         

    D)  8

    Correct Answer: C

    Solution :

                    According to Stefans law for radiated energy \[E\propto {{T}^{4}}\] Hence,  \[\frac{{{E}_{1}}}{{{E}_{2}}}=\frac{T_{1}^{4}}{T_{2}^{4}}={{\left( \frac{T}{2T} \right)}^{4}}=\frac{1}{16}\] \[\therefore \]  \[{{E}_{2}}=16\,{{E}_{1}}\]


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