The temperature of food material in a refrigerator is $4^{\circ} C$ and the temperature of the environment is $15^{\circ} C$. If a Carnot cycle is used in its working gas,find its Carnot efficiency.

  • A
    $0.038$
  • B
    $0.028$
  • C
    $0.053$
  • D
    $0.072$

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