Q. A parallel beam of fast moving electrons is incident normally on a narrow slit. A fluorescent 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 ?

 7304  243 NEETNEET 2013Wave Optics Report Error

Solution:

As speed of electrons is increased so wavelength of electrons will decreases. Therefore the angular width of the central maximum of diffrection pattern will decrease.