a. State what is meant by the de Broglie wavelength of an electron.
b. The diagram shows the principles of an electron tube used to demonstrate electron diffraction.

i. Calculate the kinetic energy E (in joules) of the electrons incident on the graphite film.
ii. Show that the momentum of an electron is equal to √2Em_e  where m_e is the mass of an electron, and hence calculate the momentum of an electron. (m_e = 9.11 × 10^–31 kg)
iii. Calculate the de Broglie wavelength of the electrons.
c. Explain how the wavelengths of neutrons and electrons moving with the same energy would compare.

Transcribed Image Text:

electron beam diffracted electrons hot cathode graphite film anode 5.0 kV Figure 28.31