Question: Electrons accelerated through a potential difference V pass through a narrow slit and strike the face of a cubic crystal, as shown in Fig. When an electron detector (an ammeter) is placed in the position shown, a maximum current is recorded on the meter when V = 50 volts.
a. What is the kinetic energy of the electrons after passing through the anode slit?
b. Find the momentum of these electrons in units of eV/c. If an approximation can be used, then do so, but explain clearly why its use is justified.
Fig. - Arrangement for electrons to interact with a crystal
c. What is the de Broglie wavelength of the electrons?
d. From your above answers and the information given in the drawing, find the interatomic spacing b in the crystal