JEE Main & Advanced Physics Transmission of Heat Question Bank Topic Test - Transmission of Heat (3-5-21)

  • question_answer
    The radiant energy from the sun incident normally at the surface of earth is \[20\ kcal/{{m}^{2}}min\]What would have been the radiant energy incident normally on the earth, if the sun had a temperature twice of the present one

    A) \[160\ kcal/{{m}^{2}}\ min\]

    B) \[40\ kcal/{{m}^{2}}\ min\]

    C) \[320\ kcal/{{m}^{2}}\ min\]

    D) \[80\ kcal/{{m}^{2}}\ min\]

    Correct Answer: C

    Solution :

    \[\frac{{{E}_{2}}}{{{E}_{1}}}={{\left( \frac{{{T}_{2}}}{{{T}_{1}}} \right)}^{4}}\]\[\Rightarrow \]\[\frac{{{E}_{2}}}{20}={{\left( \frac{2T}{T} \right)}^{4}}\]=16\[\Rightarrow \] \[{{E}_{2}}=320\ kcal/{{m}^{2}}\]min.

You need to login to perform this action.
You will be redirected in 3 sec spinner