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The MCQs below are drawn from the Physics subject category.
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441
The wave nature of light was proposed by
A. Maxwell
B. Fresnel
C. Thomas Young
D. Huygen
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Explanation
Christiaan Huygens proposed the wave theory of light; thus Huygen(s) is the historical originator of the wave concept.
442
Which of the following does not support the wave nature of light ?
A. Interference
B. Photoelectric effect
C. Diffraction
D. Polarization
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Explanation
The photoelectric effect is evidence of light's particle nature (photons), not its wave nature.
443
The first demonstration of wave nature of light was provided in 1801 by the experiment of
A. Huygen
B. Thomas Young
C. Fresnel
D. Maxwell
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Explanation
Thomas Young's 1801 double-slit experiment demonstrated the wave nature of light.
444
Though quantum theory of light can explain a number of phenomena observed with light, it is necessary to retain the wave nature of light to explain the phenomena of
A. photo-electric effect
B. Compton effect
C. black-body radiation
D. diffraction
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Explanation
Diffraction is inherently a wave phenomenon and cannot be explained by particle-only descriptions of light.
445
Experimental demonstration of wave nature of light was given in 1801 by:
A. Newton
B. Maxwell
C. Compton
D. Thomas Young
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Explanation
Thomas Young's double-slit experiment in 1801 provided experimental evidence for the wave nature of light.
446
The wave nature of light was proposed by:
A. Newton
B. Thomas Young
C. Huygen
D. None of these
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Explanation
Christiaan Huygens proposed the wave theory of light prior to later experimental confirmations.
447
For interference of light waves to take place, the required condition is
A. The light waves may come from different sources
B. The light waves must come from two coherent sources
C. The interfering waves must be non-coherent
D. The path difference of the light waves from the two sources must be large
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Explanation
Interference requires coherent sources (constant phase relationship); only coherent waves produce stable interference patterns.
448
To observe interference of light, the condition, which must be met with is that the sources must be:
A. Both of above
B. None of above
C. Monochromatic
D. Phase coherent
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Explanation
Interference requires sources of the same frequency (monochromatic) and a definite phase relationship (coherent).
449
The beat frequency is the
A. ratio of the two frequencies
B. difference of the two frequencies
C. product of the two frequencies
D. sum of the two frequencies
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Explanation
Beat frequency equals the absolute difference between the two combining frequencies.
450
The amplitude of a vibrating body placed in a resistive medium
A. remains constant with time
B. increases exponentially with time
C. cannot be observed
D. decreases exponentially with time
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Explanation
Resistive damping causes the amplitude of vibration to decay, often exponentially with time.
