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# 5. A light source is directed toward a single slit. The light passes through the slit and forms a (1 point) diffraction pattern on a screen. The

5. A light source is directed toward a single slit. The light passes through the slit and forms a
(1 point)
diffraction pattern on a screen. The distance from the slit to the screen is R and the vertical
distance of the mth dark band from the center of the pattern is ym. Which approximation must
be made to equate ym to Ry
a
Otan 0 = 0
Ocos 0 = 0
Of=0
Osin 0 = 1
6. Which term is another name for Fraunhofer diffraction? (1 point)
Omagnetic field diffraction
Ofar-field diffraction
Obright spot diffraction
Opinhole diffraction
7. Monochromatic light from a distant source is incident on a slit with a width of 0.750 mm. On a (1 point)
screen 2.00 m away, the distance from the central maximum of the diffraction pattern to the
first minimum is measured to be 1.35 mm. What is the wavelength of the light?
O101 nm
506 nm
O1012 nm
675 nm

8. Light of wavelength 585 nm passes through a slit of width 0.0666 mm, and then forms a (I point)
diffraction pattern on a distant screen. What is the maximum number of dark fringes that may
be observed on the screen? Hint: Think about the largest value that sin 6 can be. What does this
tell you is the largest that m can be? C3226
C3114
C3878
(3390 9. Light of wavelength 633 nm from a distant source is incident on a slit with a width of 0.750 (1 point)
mm wide. A diffraction pattern is observed on a screen 3.50 m away. What is the distance
between the dark fringes on either side of the central maximum? (&gt;195nun
011.8 mm
(&gt;100nnn
C3590nnn 10. Light from a point source passes through a single slit and forms a diffraction pattern on a (1 point) screen. What condition must be true for the diffraction angle 9 to equal ﬂ ?
a OThe wavelength A of the light must be much smaller than the slit width :1. OThe vertical distance of the mth dark band from the center of the pattern is equal to the slit width at.
OThe slit width a is at least half the wavelength A of the light. OThe diffraction angle 6 must be large relative to the original direction of the light.

1. Why are diffraction patterns not commonly observed in everyday situations? (I point) OMost everyday light sources are monochromatic.
ODiffraction occurs only in a vacuum. OOrdinary light sources are not point sources. OPatterns produced by diffraction are too faint to observe. 2. A beam of laser light of wavelength 505 nm passes through a thin slit of width 0.00494 mm. (1 point)
The light then forms a diffraction gradient on a distant screen. What is the smallest angle
relative to the original direction of the beam at which destructive interference occurs? Oi5.13°
Oi6.89°
Oi4.80°
Oi5.87° 3. Light of wavelength 633 nm passes through a narrow slit and forms a diffraction pattern on a (1 point)
screen 8.0 m away. A distance of 23 mm separates the centers of the ﬁrst minima on either side
of the central bright fringe. What is the width of the slit? 00.22 mm
0033 mm
0055 m
00.44 mm 4. Parallel rays of light of wavelength 633 nm pass through a slit of width 0.586 mm. A (I point)
diffraction pattern forms on a screen that is 1.25 m away ﬁ‘om the slit. What is the distance
from the central maximum to the ﬁrst minimum of the pattern? 01.08mm
05.06mm
01.35mm
02.97mm

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