JEE Main 2016 Physics question
A Carnot freezer takes heat from water at C inside it and rejects it to the room at a temperature of C. The latent heat of ice is J kg. If 5 kg of water at C is converted into ice at C by the freezer, then the energy consumed by the freezer is close to :
Answer: (4)
Solution
The heat that must be extracted from the water to freeze it is
= mL = 5×336× = 1.68×\ J.
For a Carnot refrigerator working between K and K, the coefficient of performance is
COP = = = 10.11.
The work (electrical energ
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