Conceptual Physics Ch. 27 & 28
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The sky is blue because air molecules in the sky act as tiny...
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resonators that scatter blue light
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How far is a light-second?
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300,000 km
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The shadow produced by an object held close to a piece of paper in sunlight will be...
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sharp
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Clouds are white because water molecules...
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of different sizes form clusters, scattering different colors of light.
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Complementary colors are two colors that...
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produce white light when added together
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The complementary color of blue is...
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yellow
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If molecules in the sky scattered orange light instead of blue light, sunsets would be colored...
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blue
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If you're looking for an instrument that tells what stars are made of, look for a..
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spectroscope.
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The three primary colors of light for additive mixing are...
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red, green, and blue
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If sunlight were green instead of white, the most comfortable color to wear on a hot day would be...
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green
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Different colors of light correspond to different light...
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frequencies
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Humans are most sensitive to light that is...
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yellow-green
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The main difference between a radio wave and a light wave is its...
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wavelength
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The white caps of waves as they overturn are evidence that the water has...
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broken into an assortment of tiny particles that scatter all colors.
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Clouds...
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transmit UV light
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If the sun were to disappear right now, we wouldn't know about it for 8 minutes because it takes 8 minutes..
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for light to travel from sun to earth
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Which of the following are fundamentally different from the others?
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sound waves
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A sheet of red paper will look black when illuminated with...
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cyan light
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Light reflected from a lake surface is polarized...
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horizontally
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After randomly polarized light passes through a polarizer, it is...
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totally polarized
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Solar eclipses are seen less commonly than lunar eclipses because...
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earth's shadow on the moon is larger than the moon's shadow on earth
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Light shines on a pane of green glass and a pan of clear glass. The temperature will be higher in...
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the green glass
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Sunsets are red because...
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all of the above
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When red and green light shine on a white sheet, the resulting color is...
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yellow
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Electromagnetic waves...
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can travel through a vacuum.
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Light does not pass through what kind of material?
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opaque
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The true color of water is...
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greenish blue
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What is the ultimate source of electromagnetic waves?
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vibrating charged particles
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Magenta light is really a mixture of....
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red and blue light
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The shiny surfaces of metals have most to do with...
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the free electrons in metal atoms
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Perception of death is given by...
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the combination of views in the eye-brain system
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Which of the following is NOT an electromagnetic wave?
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sound
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The source of all electromagnetic waves is..
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vibrating charges
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When Roemer took measurements of on of Jupiter's moons......(cont.)
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late
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Which of these electromagnetic waves has the shortest wave length?
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X Rays
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The colored dots that make up the color on a TV screen are...
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red, blue, and green
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Because of absorption, a polarizing filter will actually transmit 40% of incident nonpolarized light. Two polarizing filters with their axes aligned will transmit...
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between 0% and 40%
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If an electron vibrates up and down 1,000 times each second, it generates an electromagnetic wave having a...
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frequency of 1000 Hz
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Electromagnetic waves are..
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transverse waves
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Compare to the wavelength of ultraviolet waves, the wave length of infrared waves is....
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longer
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Color seen on TV result from color...
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addition
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The complementary color of green is....
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magenta
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The color of an object we see is determined by the.....
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all of the above
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The reason the sky is blue is that air molecules
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absorb and then reemit blue light, scattering it in all directions
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The primary purpose of polarized sunglasses is...
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to block glare from reflections.
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Compared to its speed in the air, the speed of light in water is...
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slower
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Light waves are...
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transverse waves
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When blue and yellow paints are mixed together, the result is green. The reason for this is that...
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between blue and yellow pigments, all colors are absorbed except green.
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What is the wavelength of an electromagnetic wave that has a frequency of 1 Hz?
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less than 1 m
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The cyan color of ocean water is evidence that the water absorbs...
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red
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Light that reflects at glancing angles from nonmetallic surfaces, such as glass, water, or roads is...
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polarized parallel to the surface
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When red and blue light shine on a white sheet, the resulting color is..
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magenta
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You are designing hand-held stereo viewers....
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the left eye sees only the left view and the right eye only sees the right view
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Colors seen on a photograph result from color...
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subtraction
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Heat lamps give off mostly
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infrared rays
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Electromagnetic waves with higher frequencies have wavelegnths that are...
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shorter
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If two polarizing filters are held with their polarization axes at right angles to each other, the amount of light transmitted compared to when their axes are parallel is...
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zero
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The color of an opaque object is determined by the light that is...
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reflected
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The colors of light emitted by incandescent gases show the...
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identities of atoms in the gas
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The three paint colors that are useful for color subtraction are...
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magenta, cyan, and yellow
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What is the frequency of an electromagnetic wave having a wavelength of 300,000 km?
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1 Hz
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Earth receives a lot of ultraviolet radiation from the sun. Luckily most of it doesn't reach the ground, because it is...
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absorbed by a protective layer of ozone gas in the upper atmosphere
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A tennis ball is most easily seen if its color is...
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yellow-green
