(a)[2]
State what the de Broglie wavelength means.
(b(i))[2]
An electron starts from rest in a vacuum and is accelerated through a potential difference of $850\text{ V}$. Show that the electron’s final momentum is $1.6 \times 10^{-23}\text{ N s}$.
(b(ii))[2]
Calculate the de Broglie wavelength of this electron.
(c)[5]
Describe an experiment to show the wave nature of electrons. You may draw a diagram if you wish.