Question

In the thermal expansion of an ideal gas :

• A. $\Delta U=0$
• B. $\Delta T=0$
• C. work done by the gas is equal to the heat supplied to the gas
• D. work done by the gas is equal to the change in internal energy

Answer 1

Answer: (A), (B), (C)

The correct options are
A $\Delta U=0$
B $\Delta T=0$
C work done by the gas is equal to the heat supplied to the gas

Thermal expansion of an ideal gas is isothermal process

There is no change in internal energy

So $△U=0$

Also there is no change in temperature in isothermal process

So $△T=0$

From 1st law of thermodynamics

$△U=Q-W$

Since $△U=0$

$Q=W$

Work done by the gas is equal to the heat supplied to the gas