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1. |
When an electron in an atom jumps from a high energy level to a lower energy
level, which process happens? |
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a) |
light is polarized |
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b) |
light is absorbed |
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c) |
light is emitted |
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d) |
light is not involved |
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e) |
can't tell unless you know what kind of atom |
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2. |
What is the main difference between the light from a laser and from an ordinary
flashlight? |
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a) |
laser light is always red |
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b) |
laser light waves are in step |
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c) |
laser light is hotter |
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d) |
laser light is cooler |
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e) |
laser light is brighter |
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3. |
Both lenses and mirrors can do this to light: |
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a) |
focus |
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b) |
reflect |
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c) |
refract |
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d) |
change the color |
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e) |
emit |
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4. |
Shadows have fuzzy edges because of diffraction. What causes this effect? |
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a) |
on an atomic scale, most objects do have fuzzy edges |
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b) |
shadows look fuzzy because our eyes can't resolve sharp detail |
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c) |
there is interference between the light beam causing the shadow and the rest of the
light in the area |
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d) |
different parts of light beam scatter from the object's edges and add to make dark and
light patterns |
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e) |
the object casting the shadow has a refractive index higher than air |
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5. |
The main difference between photography and holography is that photographic film
records light intensity; holographic film records light intensity and phase. Why does
phase information allow holograms to reconstruct 3D images? |
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a) |
phase gives information about how far the light beam traveled from a given spot on
the object compared to a reference beam |
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b) |
phase gives information about the size of the object compared to the size of the
holographic plate |
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c) |
phase compares the intensity of light coming from brighter and darker features of an
object |
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d) |
holographic plates are thicker than photographic plates so they can hold more
information like phase |
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e) |
phase describes how the object is oriented with respect to a light source, like the
phase of the moon with respect to the sun |
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6. |
The typical limit for the temporal frequency of human vision is 60 Hz. This means that
you cannot see: |
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a) |
the light from a source that is flickering faster than 60 times per second |
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b) |
the light from a source that is flickering slower than 60 times per second |
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c) |
the flashing effect of a source that is flickering faster than 60 times per second |
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d) |
the flashing effect of a source that is flickering slower than 60 times per second |
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e) |
lines spaced closer than 60 per centimeter |
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7. |
Human color vision is trichromatic. This means |
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a) |
there are three types of human color photoreceptors |
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b) |
each human color photoreceptor responds to only 3 wavelengths |
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c) |
human beings can see color in 3-dimensional objects |
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d) |
humans see only 3 colors but have many names for them |
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e) |
a human sees only 3 wavelengths but we don't all see the same 3 |
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8. |
You shine light through two linear polarizers towards a screen. Which one of the
following combinations would block light from reaching the screen? |
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a) |
the polarizers' pass directions are parallel |
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b) |
the polarizers' pass directions are 10° different from each other |
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c) |
the polarizers' pass directions are perpendicular |
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d) |
one polarizer's pass direction is 180° different from the other |
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e) |
the polarizers' pass directions are randomly oriented but there is a clear container of
sugar water between them |
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9. |
When you are trying to see a dimly lit object better, it helps to look a little to the left or
right of the object. Why? |
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a) |
this reduces the number of light rays entering the eye so you see only those that
matter |
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b) |
the cells of the retina sensitive to dim light are the rod cells located most densely off-center |
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c) |
the muscles of the eye focus better if you exercise the eye slightly |
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d) |
the eye detects motion better than stationary objects so moving your eye slightly to
the side of an object simulates relative motion |
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e) |
there is actually a blind spot at the center of your retina where the nerves exit the eye
and travel to the brain |
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10. |
Why can optical fibers carry more information by light than copper wires can
with electricity? |
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a) |
more optical frequencies than electrical frequencies can be transmitted giving better
signal reproduction |
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b) |
light travels faster than electricity so information is transmitted faster |
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c) |
light waves are smaller compared with the optical fiber than electrons compared to
the wire so more of them will "fit" |
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d) |
this is a marketing myth — optical fibers and copper wires can actually carry the same
amount of information |
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e) |
optical fibers are less susceptible to line breakage than copper wires |
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11. |
You are watching a laser show that uses red, green, and blue laser light. What is the
difference between the three colors of light? |
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a) |
speed |
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b) |
temperature |
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c) |
polarization |
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d) |
wavelength |
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e) |
none of these |
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12. |
Three lamps, red, green, and blue, are emitting equal numbers of photons per second. Which of these is true? |
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a) |
they will appear to be equally bright |
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b) |
the green will look the brightest because the human visual system is most efficient
there |
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c) |
the blue will look the brightest because its photons have the highest energy |
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d) |
the red will look the brightest because the human visual system has evolved to be
most sensitive to the red of sunsets |
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e) |
the red will look the brightest because it is the hottest |
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13. |
What is your major? |
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14. |
What is your anticipated career? |
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15. |
Name at least two ways in which the experience of this course might help you in this career. |
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16. |
Name at least 3 things you use or see everyday that are related to the science of light and
briefly describe the science involved. |
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17. |
On a scale of 1 to 5, how important is it to you personally to have an understanding of the
science of light? (1 = not important, 5 = extremely important) |
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18. |
On a scale of 1 to 5, how important is it that research in the science of light should be done
by somebody? (1 = not important, 5 = extremely important) |
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19. |
On a scale of 1 to 5, how much do you like science? (1 = hate it, 5 = love it) |
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20. |
Do you like science better because of this course? |
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