PHY 101 Light and Color Quiz
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If you double the frequency of a vibrating object, its period
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Halves
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A wave travels an average distance of 1 meter in 1 second with a frequency of 1 hertz. Its amplitude is
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Not enough information to say (Amplitude=Distance/Frequency; A=D/F)
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An object that completes 100 vibrations in 5 seconds has a period of
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None of these choices are correct (T=1/f or T=wavelength/velocity; f=20, T=1/20)
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Radio waves travel at the speed of light, 300,000 km/s. The wavelength of a radio wave received at 100 megahertz is
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3.0 m
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Red light has a longer wavelength than violet light. Which has the greater frequency?
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Violet light
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Which travels faster through a vacuum - an infrared ray or a gamma ray?
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Both travel at the same speed
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Compared to ultraviolet waves, the wavelength of infrared waves is
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Longer
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Compared to radio waves, the velocity of visible light waves in a vacuum is
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The same
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Compared to its average speed in air, the average speed of a beam of light in glass is
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Less
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Color depends on what characteristic of light?
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Its frequency
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Magenta light is really a mixture of
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Red and blue light
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Colors seen on TV results from color
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Addition
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Colors seen on the cover of our physics book result from color
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Subtraction
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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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A blue object will appear black when illuminated with
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Yellow light
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Red + Green + Blue = White (T/F)
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True
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Red + Green = Yellow = White - _______
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Blue
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Red + blue = Magenta = White - _______
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Green
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Green + Blue = Cyan = White - _______
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Red
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Yellow + Blue light = ______
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White
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Green light + ______ = White
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Magenta
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Magenta + yellow + cyan = _______
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Black
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Which has the greatest energy - a photon of infrared light, of visible light, or of ultraviolet light?
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A photon of ultraviolet light
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Light is emitted when an electron
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Makes a transition to a lower energy level
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Ultraviolet light is
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Electromagnetic energy
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The dark lines in the sun's spectrum represent light that is
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Absorbed by the sun's atmosphere
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The hottest star is the star that glows
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Blue
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The energy of a photon is related to
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None of these (Wavelength)
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The highest frequency light of those below is
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Violet
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A certain object emits infrared waves. If it were to emit light waves instead, its temperature would have to be
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Higher
