A laser beam {image} is incident on two slits 0.104 mm apart. Approximately how far apart (in m) will the bright interference fringes be on the screen 5.09 m from the double slits?

1
A laser beam image is incident on two slits
0.104 mm apart. Approximately how far apart (in
m) will the bright interference fringes be on the
screen 5.09 m from the double slits?

1. image
2. image
3. image
4. image
5. image

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2
Estimate the distance (in cm) between the central
bright region and the third dark fringe on a
screen 5.06 m from two double slits 0.502 mm
apart illuminated by 506 nm light.

1. 1.28
2. 1.79
3. 2.30
4. 1.08
5. 2.21

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3
Light is incident on a double-slit. The fifth
bright band has an angular distance of image
from the central maximum. What is the distance
between the slits (in image )? (Assume the
frequency of the light is image )

1. 20
2. 11
3. 22
4. 15
5. 27

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4
For small angle approximations the angle must be
_____ .

1. image or less
2. image or less
3. 2 radians or less
4. image or less
5. 20 radians or less

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5
Two slits separated by 0.15 mm are illuminated
with green light image Calculate the distance
(in cm) from the central bright region to the
fourth bright band if the screen is 1.2 m away.

1. 1.5
2. 1.9
3. 3.7
4. 3.6
5. 1.7

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6
Two slits are illuminated with green light
image The slits are 0.06 mm apart and the
distance to the screen is 1.6 m. At what distance
(in mm) from the central maximum on the screen is
the average intensity 47 of the intensity of the
central maximum?

1. 2
2. 5
3. 3
4. 4
5. 0.4

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7
Two slits separated by 0.055 mm are illuminated
with green light image How many bands of bright
lines are there between the central maximum and
the 14 cm position? (The distance between the
double slits and the screen is 1.0 m ).

1. 14
2. 14,259
3. 142,592
4. 142
5. 1,425

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8
Two slits are illuminated with red light image
The slits are 0.22 mm apart and the distance to
the screen is 1.25 m. What fraction of the
maximum intensity on the screen is the intensity
measured at a distance 3.2 mm from the central
maximum?

1. 0.85
2. 0.94
3. 0.83
4. 0.78
5. 0.63

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9
In a double-slit experiment, the distance between
the slits is 0.2 mm, and the distance to the
screen is 170 cm. What wavelength (in nm) is
needed to have the intensity at a point 1 mm from
the central maximum on the screen be 59 of the
maximum intensity?

1. 600
2. 460
3. 530
4. 560
5. 570

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10
In a double slit experiment, the distance between
the slits is 0.2 mm and the distance to the
screen is 150 cm. What is the phase difference
between the waves from the two slits arriving at
a point image when the angular distance of
image is image relative to the central peak,
and the wavelength is 508 nm? (Convert your
result so the angle is between 0 and image )

1. image
2. image
3. image
4. image
5. image

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11
In a double slit experiment, the distance between
the slits is 0.2 mm and the distance to the
screen is 108 cm. What is the phase difference
between the waves from the two slits arriving at
a point 6 mm from the central maximum when the
wavelength is 390 nm? (Convert your result so the
angle is between 0 and image )

1. image
2. image
3. image
4. image
5. image

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12
The electric fields arriving at a point image
from three coherent sources are described by
image image and image Assume the resultant
field is represented by image What is the
amplitude of the resultant wave at image ?

1. image
2. image
3. image
4. image
5. image

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13
An interference pattern is produced at point P on
a screen as a result of direct rays and rays
reflected off a mirror as shown in the figure
below. If the source is 102 m to the left of the
screen, 1.2 cm above the mirror, and the source
is monochromatic ( image ), find the distance
image (in mm) to the first dark band above the
screen. applet

1. 2.1
2. 1.9
3. 1.8
4. 3.1
5. 4.2

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14
An interference pattern is produced at point P on
a screen as a result of direct rays and rays
reflected off a mirror as shown in the figure
below. If the source is 127 m to the left of the
screen, 1.1 cm above the mirror, and the source
is monochromatic ( image ), find the distance
image (in mm) to the first bright fringe.
applet

1. 4.31
2. 2.87
3. 1.44
4. 1.11
5. 1.55

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15
An interference pattern is produced at point P on
a screen as a result of direct rays and rays
reflected off a mirror as shown in the figure
below. If the source is 100 m to the left of the
screen, 1.0 cm above the mirror, and the source
is monochromatic image find the condition for
maximum intensity (constructive interference) on
the screen in terms of image image and
image applet

1. image
2. image
3. image
4. image
5. none of these

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16
An interference pattern is produced at point P on
a screen as a result of direct rays and rays
reflected off a mirror as shown in the figure
below. If the source is 100 m to the left of the
screen, 1.0 cm above the mirror, and the source
is monochromatic image find the conditions for
maximum brightness on the screen in terms of
image image and image applet

1. image
2. image
3. image
4. image
5. none of these

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17
Monochromatic light image is incident on a soap
bubble image What is the wavelength of the
light (in nm) in the bubble film?

1. 212
2. 502
3. 364
4. 204
5. 509

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18
Monochromatic light image is incident on a soap
bubble image that is 59 mm thick. What is the
change of phase of the light reflected from the
front surface?

1. image
2. image
3. image
4. image
5. image

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19
Monochromatic light image is incident on a soap
bubble image that is 490 nm thick. Calculate
the change of phase of the light that penetrates
the front surface, reflects from the second
surface, and emerges through the first surface as
an angle between image and image .

1. image
2. image
3. image
4. image
5. image

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20
Monochromatic light image is incident on a soap
bubble image How thick is the bubble (in nm) if
destructive interference occurs in the reflected
light?

1. 178
2. 65
3. 4
4. 186
5. 191

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21
The light reflected from a soap bubble image
appears red image at its center. What is the
minimum thickness (in nm)?

1. 111
2. 134
3. 124
4. 169
5. 119

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22
A thin sheet of plastic image is inserted
between two panes of glass to reduce infrared
image losses. What thickness (in nm) is
necessary to produce constructive interference in
the reflected infrared radiation?

1. 102
2. 127
3. 111
4. 112
5. 110

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23
In a Newton's rings apparatus, find the phase
difference (in radians) when an air wedge of
496-nm thickness is illuminated with red light
image

1. 3
2. 12
3. 13
4. 8
5. 5

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24
The figure below shows two point sources of
light, A and B, that emit light waves in phase
with each other. A is at a distance image from
point P. B is at a distance image from P. (
image is the wavelength.) What is the phase
difference between the waves arriving at P from A
and B? applet

1. image
2. image
3. image
4. image
5. image

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25
The figure below shows two point sources of
light, A and B. B emits light waves that are
image radians out of phase with the waves from
A. A is image from P. B is image from P. (
image is the wavelength.) What is the phase
difference between waves arriving at P from A and
B? applet

1. image
2. image
3. image
4. image
5. image

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26
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 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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27
In an interference pattern, the wavelength and
frequency are _____ .

1. unchanged in regions of destructive interference
   but smaller in regions of 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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28
A planar cross section through two spherical
waves emanating from the sources image and
image in the plane is shown in the figure
below. image and image are in phase. The
black circles are one and two wavelengths from
their respective sources. The lighter circles are
one half and one and a half wavelengths distant
from their respective sources. If the waves shown
arriving at image both arrive with amplitude
image what is the resultant amplitude at point
image ? applet

1. image
2. image
3. image
4. image
5. image

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29
A planar cross section through two spherical
waves emanating from the sources image and
image in the plane is shown in the figure
below. image and image are in phase. The
black circles are one and two wavelengths from
their respective sources. The lighter circles are
one half and one and a half wavelengths distant
from their respective sources. If the waves shown
arriving at image both arrive with amplitude
image what is the resultant amplitude at point
image ? applet

1. image
2. image
3. image
4. image
5. image

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30
A planar cross section through two spherical
waves emanating from the sources image and
image in the plane is shown in the figure
below. The black circles are one and two
wavelengths from their respective sources. The
lighter circles are one half and one and a half
wavelengths distant from their respective
sources. If the phase at image and image is
zero at this instant, and the waves shown
arriving at image both arrive with amplitude
image what is the phase angle (in radians) of
each wave at point image ? applet

1. image
2. image
3. image
4. image
5. image

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31
A planar cross section through two spherical
waves emanating from the sources image and
image in the plane is shown in the figure
below. The black circles are one and two
wavelengths from their respective sources. The
lighter circles are one half and one and a half
wavelengths distant from their respective
sources. If the phase at image and image is
zero at this instant, and the waves shown
arriving at image both arrive with amplitude
image what is the difference in phase angle (in
radians) at point image ? applet

1. image
2. image
3. image
4. image
5. image

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32
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?

1. image
2. image
3. image
4. image
5. image

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33
A film of index of refraction image coats a
surface with index of refraction image When
image what is the condition for constructive
interference for reflected monochromatic light of
wavelength image in air?

1. image
2. image
3. image
4. image
5. image

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34
A film of index of refraction image coats a
surface with index of refraction image When
image what is the condition for destructive
interference for reflected monochromatic light of
wavelength image in air?

1. image
2. image
3. image
4. image
5. image

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35
Find the superposition of two waves image and
image arriving at the same point in space at
the same time.

1. image
2. image
3. image
4. image
5. image

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36
If you were to blow smoke into the space between
the barrier and the viewing screen of the figure
below, the smoke would show _____. image

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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37
In a two-slit interference pattern projected on a
screen, the fringes are equally spaced on the
screen _____.

1. everywhere.
2. only for large angles.
3. only for small angles.

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38
Which of the following will cause the fringes in
a two-slit interference pattern to move farther
apart?

1. decreasing the 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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39
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 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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40
Using the figure below as a model, sketch the
interference pattern from six slits. image

1. image
2. image
3. image
4. image

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41
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 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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42
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.
2. a bright fringe.
3. impossible to determine.

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