NEET2008PhysicsThermodynamicsActual
We consider a thermodynamic system. If U represents the increase in its internal energy and W the work done by the system, which of the following statements is true?
Options
- AU=-W in an adiabatic process
- BU=W in an isothermal process
- CU=-W in an isothermal process
- DU=W in an adiabaitc process
Correct answer
A. U=-W in an adiabatic process
Step-by-step solution
An isothermal process is a constant temperature process. In this process, aligned & T= constant or T=0 . & U=n C_V T=0 aligned An adiabatic process is defined as one with no heat transfer into or out of a system. Therefore, Q=0 From first law of thermodynamics W=- U or U=-W