When you look at a single-slit diffraction pattern produced on a screen by light of a single wavelength, you see a bright central maximum and a number of maxima on either side, their intensity decreasing with distance from the central maximum. If the wavelength of the light is increased,
a. the pattern shrinks in size (central maximum less wide; other maxima in closer to it).
b. the pattern increases in size (central maximum wider; other maxima farther from it).
c. it does not affect the size of the pattern.
d. the width of the central maximum increases, but the other maxima do not change in position or width.
e. the width of the central maximum decreases, but the other maxima do not change in position or width.
[Ques. 2] Plane waves of ultrasound, f = 51.0 kHz, impinge on a flat plane with a 1.00-cm-wide slit. What is the total angular width (2) of diffracted sound waves when the speed of sound in air is 340 m/s.
a. 167
b. 83.6
c. 19.5
d. 41.8
e. 0.11
[Ques. 3] How wide must a narrow slit be if the first diffraction minimum occurs at 12 with laser light of 633 nm?
a. 3.0 106 m
b. 3.0 105 m
c. 6.1 106 m
d. 6 .1 105 m
e. 1.5 106 m
[Ques. 4] A narrow slit is illuminated with sodium yellow light of wavelength 589 nm. If the central maximum extends to 30.0, how wide is the slit?
a. 0.500 mm
b. 2.20 106 m
c. 3.33 105 m
d. 1.18 m
e. 5.89 m
[Ques. 5] The pupil of a cat's eye narrows to a slit width of 0.5 mm in daylight. What is the angular resolution of the cat's eye in daylight ( = 500 nm)?
a. 0.01 rads
b. 105 rads
c. 103 rads
d. 104 rads
e. 0.1 rads
[Ques. 6] Helium-neon laser light ( = 6.33 107 m) is sent through a 0.30-mm-wide single slit. What is the width of the central maximum on a screen 1.0 m from the slit?
a. 2.0 cm
b. 4.2 mm
c. 1.1 cm
d. 2.0 mm
e. 0.70 mm
[Ques. 7] In a double-slit experiment using light of wavelength 486 nm, the slit spacing is 0.600 mm and the screen is 2.00 m from the slits. Find the distance along the screen between adjacent bright fringes.
[Ques. 8] When a central dark fringe is observed in reflection in a circular interference pattern, waves reflected from the upper and lower surfaces of the medium must have a phase difference, in radians, of
a. 0.
b. /2.
c. .
d. 3/2.
e. 2.
[Ques. 9] In an interference pattern, the wavelength and frequency are
a. the same in both the regions of constructive interference and the regions of destructive interference.
b. greater in regions of constructive interference than in regions of destructive interference.
c. smaller in regions of constructive interference than in regions of destructive interference.
d. unchanged in regions of destructive interference but greater in regions of constructive interference.
e. unchanged in regions of destructive interference but smaller in regions of constructive interference.
[Ques. 10] The bright and dark bands you see in a photograph of a double-slit interference pattern represent
a. the respective positions of the crests and the troughs of the light wave.
b. an interference pattern that is not present unless it is produced by the camera lens.
c. the respective positions of constructive and destructive interference of light from the two sources.
d. the respective positions of destructive and constructive interference of light from the two sources.
e. the respective positions of bright and dark particles of light.
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