Option A The angular width of central maximum will be unaffected
Option B Diffraction pattern is not observed on the screen in the case of electrons
Option C The angular width of the central maximum
Option D The angular width of the central maximum will decrease
Solution: Correct Option D
As the speed of electrons increases, the wavelength of electrons decreases, and the angular breadth () of the diffraction pattern’s center maximum decreases.
and angular width for central maxima is