Multiple Choice
Identify the
letter of the choice that best completes the statement or answers the question.
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1.
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In a
double-slit interference pattern the path length from one slit to the first dark fringe of a
double-slit interference pattern is longer than the path length from the other slit to the fringe
by a. | three-quarters of a
wavelength. | c. | one-quarter of a
wavelength. | b. | one-half of a wavelength. | d. | one full wavelength. | | | | |
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2.
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Interference
effects observed in the early 1800s were instrumental in supporting a concept of the existence of
which property of light? a. | polarization | c. | wave nature | b. | particle nature | d. | electromagnetic character | | | | |
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3.
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In
Young’s double-slit experiment, a wave from one slit arrives at a point on a screen one
wavelength behind the wave from the other slit. What is observed at that point? a. | dark
fringe | c. | multicolored
fringe | b. | bright fringe | d. | gray fringe, neither dark nor bright | | | | |
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4.
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In order to
produce a sustained interference pattern by light waves from multiple sources, which condition or
conditions must be met? a. | Sources must be coherent. | b. | Sources must be
monochromatic. | c. | Sources must be coherent and monochromatic. | d. | Sources must be neither
coherent nor monochromatic. | | |
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5.
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Two beams of
coherent light are shining on the same sheet of white paper. When referring to the crests and troughs
of such waves, where will darkness appear on the paper? a. | where the crest from
one wave overlaps the crest from the other | b. | where the crest from one wave overlaps the trough from the
other | c. | where the troughs from both waves overlap | d. | Darkness cannot occur
because the two waves are coherent. | | |
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6.
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For stable
interference to occur, the phase difference must be a. |  . | c. |  . | b. | cl. | d. | constant. | | | | |
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7.
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At the first
dark band in a single-slit diffraction pattern, the path lengths of selected pairs of wavelets differ
by a. | one
wavelength. | c. | one-half
wavelength. | b. | more than one wavelength. | d. | less than half of one wavelength. | | | | |
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8.
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If light
waves are coherent, a. | they shift over time. | b. | their intensity is less
than that of incoherent light. | c. | they remain in phase. | d. | they have less than
three different wavelengths. | | |
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9.
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Energy can
be added to a. | stimulated
emission. | c. | light
amplification. | b. | an active medium. | d. | a ray. | | | | |
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10.
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Which of the
following is the process of using a light wave to produce more waves with properties identical to
those of the first wave? a. | stimulated emission | c. | hologram | b. | active medium | d. | bandwidth | | | | |
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11.
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Which of the
following is a device that produces an intense, nearly parallel beam of coherent
light? a. | spectroscope | c. | laser | b. | telescope. | d. | diffraction grating | | | | |
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12.
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A laser
CANNOT be used a. | to treat
glaucoma. | c. | to read bar
codes. | b. | to measure distance. | d. | to reverse heart-attack damage. | | | | |
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Short Answer
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13.
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The dark
lines in a double-slit interference pattern are due to ____________________ interference, and the
bright lines are due to ____________________ interference.
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14.
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How is a
stable interference pattern produced?
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15.
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Describe the
pattern that results from the single-slit diffraction of monochromatic light.
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16.
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What is
diffraction?
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17.
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How does
diffraction occur?
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18.
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What is
resolving power?
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19.
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Why is the
resolving power for optical telescopes on Earth limited?
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20.
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What is
meant by the statement that a laser produces a narrow beam of coherent light?
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21.
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How does a
laser produce coherent light?
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22.
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What are the
advantages of using a "laser knife" in surgical procedures?
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23.
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How is a
laser used in a compact disc player?
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24.
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How are
lasers used to determine the distance from Earth to the moon?
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