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Ch 18 5 sources of light
 

Ch 18 5 sources of light

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    Ch 18 5 sources of light Ch 18 5 sources of light Presentation Transcript

    • Ch 18-5 Sources of Light Objects that give off their own light are LUMINOUS
    • Incandescent Light
      • Light produced when a object gets hot enough to glow
      • Electrons flow throw a filament in the bulb, when it gets hot it emits light.
    • Fluorescent Light
      • Emits light by causing a phosphor to steadily emit photons.
      • Essentially is it a string of collisions changing wave lengths into visible light.
      • More energy efficient than incandescent bulb
    • Laser Light
      • Laser is a beam of coherent light
      • It is emitted when excited atoms emit photons.
      • Coherent light does not spread out so it has a constant intensity.
      • Can be used to cut, heat materials. Carry information or make measurements.
    • Neon Light
      • Neon lights emit light when electrons move through a gas or a mixture of gases in glass tubing.
      • Different gases or mixtures give off different light colors.
    • Sodium-Vapor Light
      • As electric current passes through a sodium-vapor bulb it ionizes the gas mixtures. As the mixture warms up it’s heats causes the sodium to change from solid into a gas.
      • The move electrons into higher energy levels, when the electrons return to the lower energy they release energy.
      • Very energy efficient and very bright.
      • Often used as parking lot and street lights.
    • Other Lights
      • Tungsten-Halogen light - like an incandescent light but uses a tungsten filament and last longer than incandescent.
      • LED – Light Emitting Diode – they have a low energy consumption, often many are used together to produce a bright light.