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.
The principle of superposition of waves states that:
A.
At a given point in the medium, the resultant displacement is the vector sum of displacements produced by each individual wave
B.
The resultant amplitude equals the average of individual amplitudes
C.
Two waves cannot simultaneously exist at the same point
D.
Waves cancel each other when they meet
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ANSWER :
A. At a given point in the medium, the resultant displacement is the vector sum of displacements produced by each individual wave
2.
If two waves of equal amplitude 'a' meet at a point in phase, the resultant amplitude is:
A.
a√2
B.
a (no change)
C.
2a (constructive interference, intensity 4Iâ‚€)
D.
0 (destructive interference)
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ANSWER :
C. 2a (constructive interference, intensity 4Iâ‚€)
3.
If two waves of equal amplitude 'a' meet at a point exactly out of phase (phase difference π), the resultant amplitude is:
A.
2a (constructive interference)
B.
a (partial cancellation)
C.
0 (destructive interference)
D.
a²
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ANSWER :
C. 0 (destructive interference)
4.
Interference of light is based on:
A.
Total internal reflection
B.
Diffraction of light
C.
The principle of superposition of waves
D.
Polarization
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ANSWER :
C. The principle of superposition of waves
5.
Constructive interference occurs when the path difference between two coherent waves is:
A.
An integer multiple of wavelength: Δx = nλ (n = 0, ±1, ±2, ...)
B.
Equal to wavelength λ/4
C.
Equal to the wave speed
D.
An odd multiple of half-wavelength: (2n+1)λ/2
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ANSWER :
A. An integer multiple of wavelength: Δx = nλ (n = 0, ±1, ±2, ...)
6.
Destructive interference occurs when the path difference between two coherent waves is:
A.
An odd multiple of half-wavelength: (2n-1)λ/2 or (n + 1/2)λ
B.
Zero
C.
Equal to the speed of light
D.
An integer multiple of wavelength
😑 View Answer Rough Work Error
ANSWER :
A. An odd multiple of half-wavelength: (2n-1)λ/2 or (n + 1/2)λ