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NEET Sample Paper NEET Sample Test Paper-84

  • question_answer
    The heat radiated per unit area in 1 hour by a furnace whose temperature is 3000 K is \[(\sigma =5.7\times {{10}^{-8}}W{{m}^{-2}}{{K}^{-4}})\]

    A) \[1.7\times {{10}^{10}}\]J       

    B)        \[1.1\times {{10}^{12}}\]J

    C) \[2.8\times {{10}^{8}}\]J                     

    D) \[4.6\times {{10}^{6}}\]J

    Correct Answer: A

    Solution :

    [a] According to Stefan?s law \[E=\sigma \,{{T}^{4}}\] Heat radiated per unit area in 1 hour (3600s) is \[=5.7\times {{10}^{-8}}\times {{(3000)}^{4}}\times 3600=1.7\times {{10}^{10}}\,J\]


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