In a reversible adiabatic process, the ratio of $$\frac{T_1}{T_2}$$ is equal to

A

$$\left(\frac{p_1}{p_2}\right)^{\frac{\gamma - 1}{\gamma}}$$

B

$$\left(\frac{p_2}{p_1}\right)^{\frac{\gamma - 1}{\gamma}}$$

C

$$\left(\frac{v_1}{v_2}\right)^{\frac{\gamma - 1}{\gamma}}$$

D

$$\left(\frac{v_2}{v_1}\right)^{\frac{\gamma - 1}{\gamma}}$$