Answer:
0.15 nm
Explanation:
The speed of an x-ray is:
v = 3 x 10⁸ m/s
The frequency of the x-ray:
f = 2 x 10^18 Hz
The wavelength is calculated below
[tex]\begin{gathered} v=\lambda f \\ \\ \lambda=\frac{v}{f} \\ \\ \lambda=\frac{3\times10^8}{2\times10^{18}} \\ \\ \lambda=1.5\times10^{-10}m \\ \\ \lambda=1.5\times10^{-1}\times10^{-9}m \\ \\ \lambda=0.15nm \end{gathered}[/tex]
