Question

During adiabatic expansion of an ideal gas

• A. $w=-\Delta U$
• B. $w=\Delta U$
• C. $\Delta U=0$
• D. $w=0$

Answer 1

The correct option is B $w=\Delta U$

From the first law of thermodynamcis:
$\Delta U=q+w$
$q=0$
$\therefore \Delta U=w$