Answer
$\lambda = 9.42\times 10^{-7}~m$
Work Step by Step
In part (d), we found that $k = 6.67\times 10^6~m^{-1}$
We can find the wavelength:
$\lambda = \frac{2\pi}{k}$
$\lambda = \frac{2\pi}{6.67\times 10^6~m^{-1}}$
$\lambda = 9.42\times 10^{-7}~m$
