light
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Light. Review…. We already know that each color of light has its own wavelength & frequency. Refraction…. Each color refracts at a different angle. Heinrich Hertz. Proved the theory that violet light contains more energy than red light. Heinrich Hertz’s Experiment. - PowerPoint PPT PresentationTRANSCRIPT
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Light
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Review…
• We already know that each color of light has its own wavelength & frequency.
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Refraction…
• Each color refracts at a different angle.
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Heinrich Hertz
• Proved the theory that violet light contains more energy than red light.
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Heinrich Hertz’s Experiment
• When red light was shined upon the plate, few particles were emitted from the plate.
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Incandescent Light• The bottom line…. The filaments in these
bulbs get so hot they glow & produce light.• Details…. The filament is made of a metal
called tungsten. When turned on, the electrons in the filament vibrate very quickly, creating heat. It creates so much heat that it begins to glow. A toaster works the same way!
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Fluorescent
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How it works:
• There is a tube, filled with low-pressure gas.• There are electrodes at each end of the tube.• Electricity passes from one electrode to the
other, exciting the gas as the electricity passes through it.
• The gas glows, but gives off UV light.• The phosphorus coating on the tube absorbs
the UV and converts it into visible light.
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Advantages
Incandescent• Gives off full spectrum (Roy
G. Biv)• Feels “homey.”
Fluorescent• Very energy efficient• Cheaper on the energy bill
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Disadvantages
Incandescent• 90% of energy is lost as heat• Expensive energy bill
Fluorescent• Can cause eye fatigue• Can lead to mental
distraction• Harsh colors (not homey or
cozy feeling)
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