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An electron has charge 
and mass 
. It is accelerated from rest in a vacuum through a potential difference 
.
Show that the momentum 
of the accelerated electron is given by
The potential difference through which the electron is accelerated is 
.
State what is meant by the de Broglie wavelength.
Calculate the de Broglie wavelength of the electron.
The separation of copper atoms in a copper crystal is approximately 
. By reference to your answer in (b)(ii), suggest whether electron diffraction could be observed using a beam of electrons that have been accelerated through a potential difference of and are then incident on a thin copper crystal.
is the de Broglie wavelength, 
is Planck's constant and 
.
