One mole of an ideal gas at 900 K, undergoes two reversible processes, I followed by II, as shown below. If the work done by the gas in the two processes are same, the value of $$\ln \frac{V_3}{V_2}$$ is ___.

(U: internal energy, S: entropy, p: pressure, V: volume, R: gas constant)
(Given: molar heat capacity at constant volume, $$𝐶_{𝑉,𝑚}$$ of the gas is $$\frac{5}{2}R$$)