An electron beam can undergo diffraction by crystal through what potential should be a beam of electrons be accelerated - Chemistry - Structure of Atom

Question

An electron beam can undergo diffraction by crystal through what
potential should be a beam of electrons be accelerated so that its
wavelength becomes eaual to 1 54Angstom Please explain the answer
also

Pankaj Singh · Accepted Answer

Mass of electron = 9 1 Ã— 10-31 kg calculating momentum of electron using $p = \frac{h}{λ}$ $h = {6 55 \times 10}^{- 34} J s λ = 1 54 \times 10^{- 10} m$ $p = \frac{6 55 \times 10^{- 34}}{1 54 \times 10^{- 10}} = 4 25 \times 10^{- 24}$ Kinetic energy of electron = p2/2me =(4 25 x 10-24)2/ (2 x 9 1 Ã— 10-31 ) =1 x 10-17 J Now K E of electron = eV or V = K E/e =1 x 10-17 J /1 60217646 Ã— 10-19 =62 5 V

An electron beam can undergo diffraction by crystal. through what potential should be a beam of electrons be accelerated so that its wavelength becomes eaual to 1.54Angstom.Please explain the answer also.