Interference (Young's double-slit experiment and expression for fringe width, coherent sources,..) NEET Questions

Physics - Optics

Interference (Young's double-slit experiment and expression for fringe width, coherent sources,..) MCQ Questions


7.
In Young’s double-slit experiment, the intensity of the central maximum is:
A.
4I₀
B.
2I₀
C.
8I₀
D.
I₀
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ANSWER :
C. 8I₀
8.
What happens to the fringe width if the distance between the slits is doubled?
A.
Decreases
B.
Increases
C.
Remains the same
D.
Becomes zero
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ANSWER :
A. Decreases
9.
The condition for destructive interference in Young’s double-slit experiment is:
A.
Path difference = nλ
B.
Path difference = (n + 1/2)λ
C.
Phase difference = 0
D.
Amplitude difference = 0
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ANSWER :
B. Path difference = (n + 1/2)λ
10.
For sustained interference, the sources must be:

NEET - 2016

A.
Incoherent
B.
Coherent
C.
Monochromatic
D.
Unpolarized
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ANSWER :
B. Coherent
11.
Which of the following phenomena proves the wave nature of light?
A.
Interference
B.
Photoelectric effect
C.
Diffraction
D.
Polarization
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ANSWER :
A. Interference
12.
In Young’s double-slit experiment, what happens when white light is used instead of monochromatic light?
A.
Fringes are colored
B.
No interference occurs
C.
Fringes disappear
D.
Fringes remain the same
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ANSWER :
A. Fringes are colored