(Solved): Low energy electron diffraction (LEED) is a technique that exploits the wave character of electrons ...

Low energy electron diffraction (LEED) is a technique that exploits the wave character of electrons to obtain information about the lattice constant and symmetry of single crystal surfaces. (i) Calculate the energy of electrons with a wavelength of $3.5\stackrel{?}{A}$ in eV. (ii) Calculate the speed of the electrons at this wavelength in $\mathrm{m}/\mathrm{s}$. (iii) Which voltage in $V$ has to be applied to accelerate electrons to this speed from rest?