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We consider a thermodynamic system. If D...

We consider a thermodynamic system. If `DeltaU` represents the increase in its internal energy and W the work done by the system, which of the following statements is true?

A

`DeltaU=-W` is an adiabatic process

B

`DeltaU=W` in an isothermal process

C

`DeltaU=-W` in an isothermal process

D

`DeltaU=W` in an adiabatic process

Text Solution

Verified by Experts

The correct Answer is:
A
An isothermal process is a constant temperature process. In this process, `DeltaT=0,`
`therefore DeltaU=nC_(V) DeltaT=0`
An adiabatic process is defined as one with no heat transfer into or out of a system. Therefore, Q=0. From the first law of thermodynamics. `W=-DeltaU`
`or DeltaU=-W`
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