physics ch. 27
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how far is a light-minute in km
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18,000,000 km
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will the shadow produce by an object held close to a piece of paper in sunlight be fuzzy or sharp? explain
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sharp b/c it is covering more light
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what is the wavelength of an electromagnetic wave that has one a 1-HZ frequency?
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300,000,000 m
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An ideal polaroid filter will transmit 50% of nonpolarized.............
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50%
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fundamentally different: sound, x-rays, gamma rays, light, or radio?
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sound waves
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if an electron vibrates up and down 1000 times each second, what frequency of waves will be produced?
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1000 HZ
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compared to the wavelength of ultraviolet waves, is the wavelength of infrared waves longer or shorter
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longer
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what happens when randomly polarized light passes through a polarizer
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totally polarized
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which color of light carries the least energy in a single photon
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red
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what is the main difference between a radio wave and a light wave
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wavelength
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of radio, infrared, x-rays, ultraviolet, and light, which of these waves has the shortest wavelength
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x-rays
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compared to its speed In air, is the speed of light in water slower or faster
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slower
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because of absorption, a polaroid filter will actually transmit 40%
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0%
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compared to when the earth was nearest Io, the predicted times when the earth was farthest from Io were
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22 minutes longer
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why are solar eclipses seen less commonly than a lunar eclipses?
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b/c earth's shadow on the moon is larger than the moon's shadow on earth
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compared to the velocity of radio waves, is the velocity of visible light waves faster or slower
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the same
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what is the ultimate source of electromagnetic waves?
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vibrating charged particles
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the best color for this light is (photographer)
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red
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are light waves transverse or longitudinal
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transverse
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what is the main difference between a radio wave and a sound wave
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a sound wave is longitudinal and a radio wave is transverse
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do clouds block or transmit UV light
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transmit UV light
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what does a charged particle do that creates do that electromagnetic waves
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vibrate
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is it transparent to ultraviolet and infrared light
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no and no
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do electromagnetic waves require a medium
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no
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light reflected from a lake surface is polarized in what direction
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horizontally
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what color travels slowest through clear glass
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violet
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why do metals tend to have shiny surfaces
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light waves vibrate free electrons in the metal which they remit the light
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when grazing light is reflected from a surface, how is it polarized
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parallel to the surface
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heat lamps give off mostly what kind of electromagnetic waves
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infrared waves
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if the sun were to disappear right now, we wouldn't know about it for 8 minutes. why
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b/c it takes 8 minutes for light to travel from the sun to earth
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electromagnetic waves are what kind of waves
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transverse waves
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of infrared , radio, sound, light, and x-rays, which is NOT an electromagnetic wave
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sound wave
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how does light pass through opaque materials
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it can't
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according to Einstein, a light consists of massless bundles of electromagnetic energy. what are these called
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photons
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what does it mean to say that light is polarized
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when it's vibrations align in a transverse wave
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energy emitted by vibrating electric charges is carried by what general kind of waves
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electromagnetic waves
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an umbra is what kind of shadow
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in core of total darkness
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what is the name of electromagnetic heat waves
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infrared
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what is the name for the distance that light travels in one year
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light year
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can light act as both a wave and as a particle
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yes
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what specific kind of wave causes sunburn
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ultraviolet
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what kinds of electromagnetic waves are transmitted through glass
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visible light
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what distinguishes an x-ray from other electromagnetic radiation
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its wavelength
