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Question: Answered & Verified by Expert
A gas does 4.5 J of external work during adiabatic expansion. If its temperature falls by 2 K, then its internal energy will be 
PhysicsThermodynamicsNEET
Options:
  • A Increased by 4.5 J
  • B Decreased by 4.5 J
  • C Decreased by 2.25 J
  • D Increased by 9.0 J
Solution:
1811 Upvotes Verified Answer
The correct answer is: Decreased by 4.5 J
According to first law in thermodynamics dQ=dU+dW and for adiabatic dQ=0

  dQ=0

dU=-dW

dU=-4.5 J

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