A wire of length 'L' and linear density 'm' is stretched by a force 'T' and the frequency is $n_1$. Another wire of the same material of length 2L and same linear density is stretched by a force 9T and its frequency is $n_2$ . Value of $(n_2 / n_1 )$ is,

Question

$\begin {array} {1 1} (1)\;4\: : \: 1 & \quad (2)\;1\: : \: 3 \\ (3)\;3\: : \: 2 & \quad (4)\;1 \: : \: 2 \end {array}$