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Question: Answered & Verified by Expert
The internal energy change in a system that has absorbed $2 \mathrm{k}$ cal of heat and done $500 \mathrm{~J}$ of work is :
PhysicsThermodynamicsNEETNEET 2009 (Mains)
Options:
  • A $7900 \mathrm{~J}$
  • B $8900 \mathrm{~J}$
  • C $6400 \mathrm{~J}$
  • D $5400 \mathrm{~J}$
Solution:
1307 Upvotes Verified Answer
The correct answer is: $7900 \mathrm{~J}$
$\mathrm{dU}=\mathrm{Q}-\mathrm{W}=8400-500=7900 \mathrm{~J}$

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