Question

n moles of an ideal monoatomic gas undergoes an isothermal expansion at temperature T during which its volume becomes 4 times. The work done on the gas and change in internal energy of the gas respectively is

• A. n RT Ln 4,0
• B. - n RT Ln 4,0
• C. n RT Ln 4 $\frac{3nRT}{2}$
• D. - n RT Ln 4, $\frac{3nRT}{2}$

Answer 1

The correct option is A n RT Ln 4,0

$\begin{array}{c}w=nRT\ln \left(\frac{4v}{v}\right)\\ =nRT\ln 4\&\Delta u=0\end{array}$

$\therefore$ Option $A$ is correct.