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AMU Medical AMU Solved Paper-1999

  • question_answer
    The star Sirius is emitting radiation with the radiant intensity (energy emitted per unit area per second) of\[1.2\times {{10}^{7}}W/{{m}^{2}}\]the colour of this star will be

    A)  blue               

    B)  yellow

    C)  green             

    D)  red

    Correct Answer: A

    Solution :

    : By Stefans law of radiation, \[R=\sigma {{T}^{4}}\]where \[\sigma =5.67\times {{10}^{-8}}W{{m}^{-2}}{{K}^{-4}}\] or \[{{T}^{4}}=\frac{R}{\sigma }=\frac{1.2\times {{10}^{7}}}{5.67\times {{10}^{-8}}}\] or \[T=3814\text{ }K\] The star at 3814 K will appear blue.


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