Calculate the Wavelength of Light of Energy 1 KeV Divided $\times$

Multiple Choice

Calculate the wavelength of light of energy 1 keV divided by the de Broglie wavelength of a proton of kinetic energy 1 meV.

A) 1.4
B) 1.0 $\times$ 10^-6
C) 1.0 $\times$ 10⁶
D) 1.9
E) 0.73