Physics chapter 26 – Flashcards
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In order that electromagntic induction occurs in a cirucit there must be a
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Change in magnetic field intensity
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Is the current that is produced by a generator ac or DC
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Ac
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What transforms from one coil into another in a transformer is
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Power
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Do generators produce energy
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No, the convert it from some other form of electrical energy
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What exactly does a step down transformer step down
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Voltage
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In a step down transformer, how does input current compare with output current
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The output current is greater
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Does the transmission of electric energy require electrical conductors b/w the source and receiever
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No. Sunlight transports electromagnetic power thru a vacuum
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What do we call electromagnetic waves in the range of frequencies that match what our eyes can see
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Visible light
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What produces an electromagnetic wave
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Oscillating or accelerating electric charge
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The electromagnetic waves having the highest speed in free space are
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None bc gamma radio and light all have same speed
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What is the color of visible light of the lowest frequencies? Of highest frequencies
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Red, violet
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At how much of the measured electromagnetic spectrum does light occupy
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Less than 1 millionth of 1%
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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 temp increase
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What is the fate of the energy in visible light that is incident upon glass
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Visible light will be transmitted by the glass, losing little energy, so energy remains visible light energy
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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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How do the rods in the eye differ from the cones
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Rods are rod shaped and more sensitive to dim light. The cones are cone shaped and color sensitive
