Thermodynamics Question 212
Question: In an isothermal process the volume of an ideal gas is halved. One can say that
[MP PMT 2004]
Options:
A) Internal energy of the system decreases
B) Work done by the gas is positive
C) Work done by the gas is negative
D) Internal energy of the system increases
Show Answer
Answer:
Correct Answer: C
Solution:
For isothermal process $ dU=0 $
and work done $ =dW=P(V _{2}-V _{1}) $
$ \because \ V _{2}=\frac{V _{1}}{2}=\frac{V}{2} $
$ dW=-\frac{PV}{2} $
