Question

The correct option for free expansion of an ideal gas under adiabatic condition is :

• A. q = 0, $\Delta$ T = 0 and w = 0
• B. q = 0, $\Delta$ T < 0 and w > 0
• C. q < 0, $\Delta$ T = 0 and w = 0
• D. q > 0, $\Delta$ T > 0 and w > 0

Answer 1

Answer: (A)

For free expansion of ideal gas $P _{ e x t }= 0$
$W _{ p v }= 0$
$q = 0$ (adiabatic process)
$\Delta E = q + w$
$\Delta E = 0$
$\Delta E = n C _{ v m } \Delta T = 0$
$q = 0 , \Delta \mathbf { T } = 0 , w = 0$