Question

13.The diffraction phenomena is noticeable only when ----- *
1 point
(a) The slit width is large
(b) The source is polychromatic
(c) The slit width is of the order of wavelength
(d) An object is transparent​

Answer 1

Answer :

Particle diffraction

• Because the wavelength for even the smallest of macroscopic objects is extremely small, diffraction of matter waves is only visible for small particles, like electrons, neutrons, atoms and small molecules.

Answer 2

The diffraction phenomenon is noticeable only when The slit width is of the order of wavelength. (option - c)

• The diffraction phenomenon occurs always at all wavelengths but is visible only when the slit width is of the order of the wavelength of light.
• This is an example of constructive interference which results in maximum diffraction intensity (easily visible).

• Larger slit width leads to direct passing of the maximum amount of light without undergoing diffraction, therefore option a is incorrect.
• When Polychromatic light is used, each wavelength of light will show its diffraction pattern, this makes it difficult to notice the diffraction pattern as all overlap.