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Understanding Light: Nature, Types, and Properties

Explore the formation of light through electron energy levels, characteristics of incandescent, fluorescent, and neon lights, and the differences between light and sound waves.

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Understanding Light: Nature, Types, and Properties

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  1. LIGHT

  2. Waves formed when an electric field combines with a magnetic field The two fields are perpendicular to each other and the direction of the wave Electromagnetic Waves

  3. the EMS is the arrangement of the electromagnetic waves in order of wavelength and frequency Electromagnetic Spectrum Radiowaves, microwaves, infrared,visiblelight,ultraviolet,x-rays,gammarays

  4. Visible Light • visible light is a transverse wave that produces both electric and magnetic fields; therefore it is called an electromagnetic wave

  5. All forms of light come from the atom • Light is formed by: • the atom is made of electrons orbiting a nucleus on a particular energy level. The electrons absorb energy. • The electrons become "excited" and move to another energy level further from the nucleus. • The atom is unstable because the electrons are out of their normal places. The electrons move back. To do so, they must lose energy in the form of light. Nature of Light

  6. Types of Light Incandescent Light • Filament is heated to white hot. • Hot filament emits light. • Produces more heat than light. Uses: toaster, hatching eggs

  7. Types of Light Fluorescent Light • Gases inside the tube are “excited” by electricity creating UV light which hits a white coating inside the tube. This coating then emits white light. • 4 times as much light as incandescent • Not much energy lost to heat • More efficient than incandescent

  8. Types of Light Neon Light • Electricity passes through a tube containing a gas. • The color of the light depends upon the gas in the tube.

  9. Light vs. Sound

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