The efficiency of Carnot engine is $50\%$ and temperature of sink is $500\,K.$ If the temperature of source is kept constant and its efficiency is to be raised to $60\%$ then the required temperature of sink will be ........... $\mathrm{K}$

  • A

    $600$

  • B

    $500$

  • C

    $100$

  • D

    $400$

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