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NEET2015PhysicsThermodynamicsActual

The coefficient of performance of a refrigerator is 5 . If the temperature inside the freezer is - 20 ° C , the temperature of the surrounding to which it rejects heat is:

Options

  1. A41  ° C
  2. B11  ° C
  3. C21  ° C
  4. D31  ° C

Correct answer

D. 31  ° C

Step-by-step solution

Coefficient of Performance = q 2 w = q 2 q 1 - q 2 = T c T H - T C = 5 T C = 5 T H - 5 T c 6 T c = 5 T H T H = 6 5   × 253   K = 303.6   K = 30.6   ° C = 31   ° C

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