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JIPMER Jipmer Medical Solved Paper-1997

  • question_answer
    A body radiates 5 W energy at a temperature of 400 K. If the temperature is increased to 1200 K. Then it radiates energy at the rate of:

    A)  410 watt                             

    B)  405 watt             

    C)         200 watt             

    D)         81 watt

    Correct Answer: B

    Solution :

    Here: Initial radiated energy \[{{E}_{1}}=5\,watt\] Initial temperature \[{{T}_{1}}=400\,K\] Final temperature \[{{T}_{2}}=1200\,K\] According Stefans law that energy \[E\propto {{T}^{4}}\] Hence, \[\frac{{{E}_{1}}}{{{E}_{2}}}={{\left( \frac{{{T}_{1}}}{{{T}_{2}}} \right)}^{4}}\]   or    \[\frac{5}{{{E}_{2}}}={{\left( \frac{400}{1200} \right)}^{4}}\]


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