Question: A beam of electrons having a well-defined energy is incident on a pair of very narrow slits whose center-to-center separation is 0.1 μm (Fig.). On a fluorescent screen 2m away the electrons produce an intensity pattern whose maxima are spaced by 1mm.
a. What does the very existence of such an intensity pattern tell you about electrons?
b. What is the momentum of these electrons?
c. What is their kinetic energy?
Fig. - Electrons incident on a pair of slits