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NEET AIPMT SOLVED PAPER SCREENING 2009

  • question_answer
    A black body at 227°C radiates heat at the rate of 7 cal \[\frac{\pi a\sqrt{3}}{T}\]. At a temperature of 727°C, the rate of heat radiated in the same units will be

    A) 60                          

    B)        50                          

    C)        112                        

    D)        80

    Correct Answer: C

    Solution :

    Key Idea Apply Stefan's law of radiation. \[\overrightarrow{F}.\overrightarrow{\tau }=0\] \[\text{m}{{\text{s}}^{-1}}\] \[\text{m}{{\text{s}}^{-1}}\]       \[\text{m}{{\text{s}}^{-1}}\]                 \[\text{mm}{{\text{s}}^{-1}}\]                 \[3.2\pi \mu V\]


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