It Is Desired to Obtain a Diffraction Pattern for Electrons

Multiple Choice

It is desired to obtain a diffraction pattern for electrons using a diffraction grating with lines separated by 10 nm. The mass of an electron is 9.11 × 10^-31 kg.
-Suppose it is desired to observe diffraction effects for a beam of electromagnetic radiation using the same grating. Roughly, what is the required energy of the individual photons in the beam?

A) 10^-6 eV
B) 10^-4 eV
C) 10^-2 eV
D) 10² eV
E) 10⁴ eV