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?
Answer & explanation
Correct answer: option 3
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.