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Question: Answered & Verified by Expert
A refrigerator absorbs 2000 cal of heat from ice trays. If the coefficient of performance is 4, then work done by the motor is
PhysicsThermodynamicsNEET
Options:
  • A 2100 J
  • B 4200 J
  • C 8400 J
  • D 500 J
Solution:
1400 Upvotes Verified Answer
The correct answer is: 2100 J

Q2=2000 cal

Coefficient of performance, COP=Q2W

W=Q2COP=500 calW=500×4.2 J=2100 J

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