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If the amount of heat given to a system ...

If the amount of heat given to a system is 3 5 J and the amount of work done on the system is 15 J, then the change in internal energy of the system is

A

`-50 J`

B

20 J

C

30 J

D

50 J

Text Solution

Verified by Experts

The correct Answer is:
D
According to first law of thermodynamics
`DeltaQ = DeltaU + DeltaW`
`DeltaU = DeltaQ - DeltaW`
`DeltaQ = 35 J, DeltaW = -15 J`
`therefore DeltaU = 35 J -(-15 J) = 50 J`
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