Chapter 26 – Physics – Flashcards
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The sound coming from one tuning fork can force another to vibrate. What is the analogous effect for light?
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The light emitted by resonant vibrations of an electron around one atom can be absorbed by an electron with the same resonant frequency of vibration in another atom.
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In what region of the electromagnetic spectrum is the resonant frequency of electrons in glass?
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Ultraviolet
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What is the fate of the energy in ultraviolet light that is incident upon glass?
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Ultraviolet light will be absorbed by the resonant vibration of electrons and turned into internal energy and a temperature increase.
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What is the fate of the energy in visible light that is incident upon clear glass?
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Visible light will be transmitted by the glass, losing little energy in the process, so the energy remains visible light energy.
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What is the fate of the energy in infrared light incident on glass?
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Infrared light will make atoms vibrate, thus becoming internal energy and a temperature increase.
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Why do opaque materials become warmer when light shines on them?
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Vibrations given by the light to their electrons, atoms, and molecules that absorb the light become internal energy, thus leading to a temperature increase.
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Why are metals shiny?
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Free electrons in metals vibrate when light strikes them, thereby reemitting the light as reflected light.
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Kids in elementary school get this right: Which color of light gets through red glass?
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Red
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When visible light is incident upon clear glass, atoms in the glass
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Are forced into vibration
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When ultraviolet light is incident upon glass, atoms in the glass
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Resonate
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Glass is transparent to wave frequencies that
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are below its natural frequencies.
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The sensation of color is seen when light falls on the eye's
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cones
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The main difference between the retina of a human eye and that of a dog's eye is the
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absence of cones in a dog's retina.
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Colors are barely seen or not at all in nighttime because moonlight
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is too dim to activate the retina's cones.
