Physics Exam: CH 27/28
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Electromagnetic waves are (transverse or longitudinal)
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Transverse waves
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Electromagnetic waves
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Can travel through a vacuum
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Which of these electromagnetic waves has the shortest wavelength: Radio waves, Infrared waves, xrays, ultraviolet waves, Light waves.
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Xrays
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Compared to the wavelength of ultraviolet waves, the wavelength of infrared waves is
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Longer
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Compared to the velocity of radio waves, the velocity of visible light waves is
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the same
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The source of all electromagnetic waves is
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vibrating charges
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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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If the sun were to disappear right now, we wouldnt know about it for 8 minutes because it takes 8 minutes
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for light to travel from the sun to the earth
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Which of the following is NOT an electromagnetic wave?: Sound, radio, infrared, light, xray
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Sound
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Heat lamps give off mostly
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infrared waves
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Compared to air, the speed of light in water is
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slower
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The shadow produced by an object held close to a piece of paper in sunlight would be
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Sharp
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The reason solar eclipses are seen less commonly than lunar eclipses is that
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The earth's shadow covers the moon but the moon's shadow does not cover the earth
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The shiny surfaces of metals has most to do with
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the looseness of electrons in metal atoms
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A photographer wished to use a safety light in the darkroom that will emit low-energy photons. The best color of this light is
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red
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Which color carries the most energy in a single photon
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Blue
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How far is a light second?
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300,000 KM
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When grazing light is reflected from a surface, it is
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polarized parallel to the surface
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Light reflected from a lake surface is polarized
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Horizontally
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If two polaroid 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 object we see is determined by the: A. frequencies of light absorbed by the object, B. frequencies of light reflected by the object C. Colors of light shining on the object D. Colors of light reflected by the object E. All the above
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All the above
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Sunlight contains all colors of light, but much of it is
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Yellow-Green
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The 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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On the moon, the daytime sky looks
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black
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Light shines on a pane of green glass and a pane of clear glass. The temperature will be higher in
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The green glass
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A tennis ball is more easily seen if its color is
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Yellow-Green
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Different colors of light correspond to different light
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frequencies
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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 color of an opaque object is determined by the light that is
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reflected
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If sunlight were red instead of white, the most comfortable color to wear on a hot day would be
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red
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The sky is blue because air molecules in the sky
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absorbe then reemit blue light, scattering it in all directions.
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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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The true color of water is
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cyan
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The white caps of waves as they overturn is evidence that the water has
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broken into many sizes of particles that scatter all colors
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The colors of light emitted by incandescent gases show
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the identities of atoms in the gas
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Spectral lines in a line spectrum take the shape of lines because the
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light is polarized
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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 light from each element produces its own unique line spectrum. This is because:
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Each element has its own distinct configuration of electrons which emits distinct frequencies of light. AND The frequencies of light emitted by atoms in the gaseous state are the \"fingerprints\" of those elements (A and B)
