NEET 2013 Physics question

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 ?

(1)Diffraction pattern is not observed on the screen in the case of electrons
(2)The angular width of the central maximum of the diffraction pattern will increase
(3)The angular width of the central maximum will decreaseCorrect
(4)The angular width of the central maximum will be unaffected

Answer: (3)

Solution

Moving electrons behave as waves with de Broglie wavelength . When the speed increases, decreases. For single-slit diffraction (slit width ), the angular width of the central maximum is $2θ ≈

See the full step-by-step solution

Create a free account to read the complete working, and practise questions like this in a timed test.

Create a free account

Question ID VK-091336