Describe what wave-particle duality means.
State the relationship between a particle’s de Broglie wavelength $\lambda$ and its momentum $p$. State the meaning of any other symbols that you use.
A narrow beam of electrons, all travelling at the same speed, is incident normally on a carbon film. The electrons then continue to a fluorescent screen, as shown in Fig. 9.1. The apparatus is in a vacuum. The pattern formed on the screen is shown in Fig. 9.2.
Explain why the pattern in Fig. 9.2 gives experimental evidence to show that the electrons have a wave nature.
The speed of the electrons is increased. Suggest, with a reason, how this change alters the pattern seen on the screen.
Explain why the pattern in Fig. 9.2 gives experimental evidence to show that the electrons have a wave nature.
The speed of the electrons is increased. Suggest, with a reason, how this change alters the pattern seen on the screen.