(a)[1]
State what the de Broglie wavelength refers to.
(b(i))[1]
State the name of the phenomenon shown by the pattern in Fig. 7.2.
(b(ii))[2]
Explain what can be concluded from the pattern in Fig. 7.2 about the nature of electrons.
(c(i))[2]
On Fig. 7.3, sketch the pattern now seen on the fluorescent screen in Fig. 7.1.
(c(ii))[3]
Explain, with reference to de Broglie wavelength, the change in the pattern on the fluorescent screen.