First slide

Thermodynamic processes

Question

In free expansion process.
a) Work is done on the system
b) work is done by the system
c) work done is zero.

Easy

A

a only
B

b only
C

c only
D

b (or) c

Solution

$Δ Q = 0 in free expansion$
$Δ U = 0$ in free expansion
From 1st law of thermodynamics
$\begin{array}{l} Δ Q = Δ U + Δ W \\ 0 = 0 + Δ W \\ Δ W = 0 \end{array}$

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