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In a thermodynamic process, a system abs...

In a thermodynamic process, a system absorbs 2 kilo calorie of heat and at the same time does 500 J of work. What is the change in internal energy of the system:

A

`-500 J`

B

500 J

C

7900 J

D

8900 J

Text Solution

Verified by Experts

The correct Answer is:
C
Since `dQ=dU+dW`
`therefore dU =dQ-dW`
Here `dQ =2000" cal. "=2000xx4 cdot 2=8400 J and dW=500 J`
`therefore dU =8400 -500=7900 J`
Thus, correct choice is (c ).
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