Question

If $U$ and $W$ represent the increase in internal energy and work done by the system respectively in a thermodynamical process, which of the following is true?

• A. $U=W$, in a adiabatic process
• B. $U=W$, in a isothermal process
• C. $U=W$, in a isochoric process
• D. $U=W$, in a isobaric process

Answer 1

The correct option is A $U=W$, in a adiabatic process

$△U=q+W$

for an adiabatic process, $q=0$

$\therefore △U=W$

i.e; increase or decrease in Internal energy is equal to work done.