Answer
11.118 m
Work Step by Step
For an electromagnetic wave $c=f\lambda$ where $c$ is the speed of light (equal to $2.9979\times10^{8}\,m/s$), $f$ is the frequency and $\lambda$ is the wavelength of the electromagnetic wave.
Given, $f=26.965\,MHz=26.965\times10^{6}\,Hz$
$\implies \lambda=\frac{c}{f}=\frac{2.9979\times10^{8}}{26.965\times10^{6}}=11.118\,m$