A black body, at a temperature of $227\,^oC$ radiates heat at a rate of $7\, cal\, cm^{-2} \,s^{-1}$. At a temperature of $727\,^oC$, the rate of heat radiated in the same $units$ will  be ..... $unit$

  • A

    $80$

  • B

    $60$

  • C

    $50$

  • D

    $112$

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