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NEET Sample Paper NEET Sample Test Paper-55

  • question_answer
    The temperature of two bodies A and B are respectively \[727{}^\circ C\] and\[327{}^\circ C\]. The ratio \[{{H}_{A}}\,\,:\,\,{{H}_{B}}\,\] of the rates of heat radiated by them is

    A) \[727:327~\]                 

    B) \[5\,\,:\,\,3\]

    C) \[25:9\]             

    D) \[625:81\]

    Correct Answer: D

    Solution :

    \[Q\propto {{T}^{4}}\] \[\Rightarrow \,\,\,\frac{{{H}_{A}}}{{{H}_{B}}}\,\,=\,\,{{\left( \frac{273+727}{273+327} \right)}^{4}}\,=\,\,{{\left( \frac{10}{6} \right)}^{4}}\,=\,\,{{\left( \frac{5}{3} \right)}^{4}}\,\,=\,\,\frac{625}{81}\,\]


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