A parallel beam of fast moving electrons is incident normally on a narrow slit. A screen is placed at a large distance from the slit. If the speed of the electrons is increased which of the following statements is correct?

The angular width of the central maximum will decrease

The angular width depends upon the ratio of fringe width to the distance between the slits and the screen. By de-broglie hypothesis, with larger velocities, the wavelength associated is smaller. Therefore, the angular width will decrease.