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Light

Light. Spectrum. White light is composed of many colors Passing light thru a prism reveals the colors of the spectrum. Wavelength. Distance between crests of the wave. Different colors are due to different wavelengths of light. figure 08-04.jpg. Figure 8.4. Figure 8.4.

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Light

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  1. Light

  2. Spectrum • White light is composed of many colors • Passing light thru a prism reveals the colors of the spectrum

  3. Wavelength • Distance between crests of the wave. • Different colors are due to different wavelengths of light.

  4. figure 08-04.jpg Figure 8.4 Figure 8.4

  5. Electromagnetic Spectrum • Radio waves 100 M • Microwaves 10-3 M or mm • Infrared 10-6 M or um • Visible light 10-10 M or Angstrum • 4000-7000 • Ultraviolet 100-4000 Angstrums • X-ray 1-100 Angstrums

  6. figure 08-05.jpg Figure 8.5 Figure 8.5

  7. Photons • Light is also emitted as a particles. • Photons have specific amounts of energy. • Depends on the wavelength as well.

  8. Absorption/Emission • Electrons of atoms absorb light energy • They move to higher energy levels • When they return the energy is emitted • Energy is usually emitted as heat or light and at specific wavelengths

  9. figure 08-06.jpg Figure 8.6 Figure 8.6

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