$\begin {array} {1 1} (A)\;\large\frac{T_1}{T_2} = \bigg( \large\frac{L_1}{L_2} \bigg)^{ \large\frac{2}{3}} & \quad (B)\;\large\frac{T_2}{T_1} = \bigg( \large\frac{L_1}{L_2} \bigg)^{ \large\frac{5}{3}} \\ (C)\;\large\frac{T_1}{T_2} = \bigg( \large\frac{L_2}{L_1} \bigg)^{ \large\frac{5}{3}} & \quad (D)\;\large\frac{T_1}{T_2} = \bigg( \large\frac{L_2}{L_1} \bigg)^{ \large\frac{2}{3}} \end {array}$