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A system absorbs 640 J heat and does wor...

A system absorbs 640 J heat and does work of 260 J, the change in internal energy of the system will be :

A

`+380J`

B

`-380J`

C

`+900J`

D

`-900J`

Text Solution

Verified by Experts

The correct Answer is:
B
The system has been given internal energy of 640 J and the work system does on surroundings is 260 J.
Therefore, by first law of thermodynamics the internal energy of system increases by
`-q=DeltaU-W=(-640+260)=-360J`
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