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


1.
Which of the following is a necessary condition for sustained interference?
A.
Same amplitude
B.
Same phase
C.
Same frequency
D.
Same direction
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ANSWER :
C. Same frequency
2.
In Young鈥檚 double-slit experiment, what happens to the fringe width if the wavelength of light is increased?
A.
Increases
B.
Decreases
C.
Remains the same
D.
Becomes zero
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ANSWER :
A. Increases
3.
Coherent sources must have:
A.
Same amplitude
B.
Same phase
C.
Same wavelength
D.
Same speed
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ANSWER :
C. Same wavelength
4.
In Young鈥檚 double-slit experiment, what is the phase difference between two adjacent bright fringes?
A.
蟺
B.
2蟺
C.
蟺/2
D.
0
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ANSWER :
B. 2蟺
5.
What is the expression for fringe width in Young鈥檚 double-slit experiment?
A.
位D/d
B.
d/位
C.
位/d
D.
d位
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ANSWER :
A. 位D/d
6.
Young鈥檚 double-slit experiment demonstrates:

NEET - 2015

A.
Polarization
B.
Interference
C.
Diffraction
D.
Photoelectric effect
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ANSWER :
B. Interference