Work-done during adiabatic expansion is given by (where p₁, v₁, T₁ = Pressure, volume and temperature for the initial condition of gas, p₂, v₂, T₂ = Corresponding values for the final condition of gas, R = Gas constant and $$\gamma $$ = Ratio of specific heats)

A. $$\frac{{{{\text{p}}_1}{{\text{v}}_1} - {{\text{p}}_2}{{\text{v}}_2}}}{{\gamma - 1}}$$

B. $$\frac{{{\text{mR}}\left( {{{\text{T}}_1} - {{\text{T}}_2}} \right)}}{{\gamma - 1}}$$

C. $$\frac{{{\text{mR}}{{\text{T}}_1}}}{{\gamma - 1}}\left( {1 - \frac{{{{\text{p}}_2}{{\text{v}}_2}}}{{{{\text{p}}_1}{{\text{v}}_1}}}} \right)$$

D. All of these

Answer: Option D