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

  • question_answer
    If the initial temperatures of metallic sphere and disc, of the same mass, radius and nature are equal, then the ratio of their rate of cooling in same environment will be  [J & K CET 2004]

    A)            1 : 4                                          

    B)            4 : 1

    C)            1 : 2                                          

    D)            2 : 1

    Correct Answer: D

    Solution :

               \[E\propto A{{T}^{4}}\] Þ \[\frac{{{E}_{\text{sphere}}}}{{{E}_{\text{Disc}}}}=\frac{4\pi {{r}^{2}}}{2\pi {{r}^{2}}}\times {{\left( \frac{T}{T} \right)}^{4}}=\frac{2}{1}\]


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