Electrons are accelerated from rest through a potential difference of before entering…
PHYSICS · Multi-part · A Level · Physics · Particles and radiation · Particles and radiation
Problem
Electrons are accelerated from rest through a potential difference of 54V before entering a crystal with lattice spacing 0.28nm. (Constants: h=6.63×10−34J⋅s, me=9.11×10−31kg, elementary charge e=1.60×10−19C.)
(a) Determine the wavelength of the electrons.
(b) State whether first-order diffraction by the crystal planes is likely, and justify your answer briefly.