Answer
The required length of the pipe is $1.3~m$
Work Step by Step
We can assume that the speed of sound in air is $343~m/s$. We can find the length of the pipe:
$\lambda = \frac{v}{f}$
$2L = \frac{v}{f}$
$L = \frac{v}{2f}$
$L = \frac{343~m/s}{(2)(130.8~Hz)}$
$L = 1.3~m$
The required length of the pipe is $1.3~m$.
