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What do the bright and dark bands you
see in a photograph of a four-slit
interference pattern represent?
1. The image of the sources of light that
20% 20% 20% 20% 20%
these slits represent.
2. The respective positions of bright and
dark particles of light.
3. The respective positions of the crests
and the troughs of the light wave.
4. An interference pattern that is not
present unless it is produced by the
camera lens.
5. The respective positions of
constructive and destructive
interference of light from the four
sources.
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In an interference pattern, the wavelength
and frequency are _____ .
1. unchanged in regions of destructive
interference but smaller in regions of 20% 20% 20% 20% 20%
constructive interference.
2. unchanged in regions of destructive
interference but greater in regions of
constructive interference.
3. the same in both the regions of constructive
interference and the regions of destructive
interference.
4. greater in regions of constructive
interference than in regions of destructive
interference.
5. smaller in regions of constructive
interference than in regions of destructive
interference.
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When a central dark fringe is observed in reflection in a
circular interference pattern, what is the phase
difference (in radians) of the waves reflected from the
upper and lower surfaces of the medium?
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1. no evidence of
interference between the
barrier and the screen.
2. evidence of interference
everywhere between the
barrier and the screen.
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In a two-slit interference pattern projected
on a screen, the fringes are equally
spaced on the screen _____.
1. everywhere. 33% 33% 33%
2. only for large
angles.
3. only for small
angles.
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Which of the following will cause the
fringes in a two-slit interference pattern to
move farther apart?
1. decreasing the 25% 25% 25% 25%
wavelength of the light
2. decreasing the screen
distance L
3. decreasing the slit
spacing d
4. immersing the entire
apparatus in water.
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At dark areas in an interference pattern, the light waves have
canceled. Thus, there is zero intensity at these regions and,
therefore, no energy is arriving. Consequently, when light waves
interfere and form an interference pattern, _____.
1. energy conservation is violated
because energy disappears in 33% 33% 33%
the dark areas
2. energy transferred by the light
is transformed to another type
of energy in the dark areas
3. the total energy leaving the
slits is distributed among light
and dark areas and energy is
conserved
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In a laboratory accident, you spill two liquids onto water, neither of
which mixes with the water. They both form thin films on the water
surface. When the films become very thin as they spread, you
observe that one film becomes bright and the other dark in
reflected light. The film that is dark _____.
1. has an index of refraction 25% 25% 25% 25%
higher than that of water.
2. has an index of refraction
lower than that of water.
3. has an index of refraction
equal to that of water.
4. has an index of refraction
lower than that of the
bright film.
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One microscope slide is placed on top of another with their left edges in
contact and a human hair under the right edge of the upper slide. As a
result, a wedge of air exists between the slides. An interference pattern
results when monochromatic light is incident on the wedge. At the left
edges of the slides, there is _____.
1. a dark fringe. 33% 33% 33%
2. a bright fringe.
3. impossible to
determine.
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