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5th grade chapter 14 section 3 - what is light energy

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5th grade chapter 14 section 3 - what is light energy

  1. 1. CHAPTER 14 SECTION 3
  2. 2. Electromagnetic Radiation–a combination of electrical and magneticenergy• Like sound, light travels in waves that havecertain wavelengths and frequencies.• Its speed is different in different materials.• Light can be reflected or absorbed by certainobjects, or it can pass through them.
  3. 3. Electromagnetic Radiation• Some types of electromagnetic radiation havewavelengths that are shorter than those ofvisible light.ex: ultraviolet, x-ray, & gamma ray radiation• Longer waves have lower frequencies andlower energies.ex: infrared waves, microwaves,& radio waves.
  4. 4. How Does Light Move?• Light travels the fastest in a vacuum.• It travels more slowly through materialssuch as air or water.• Moves in straight lines.• If it reflects off an object light still movesin a straight line but in a differentdirection.
  5. 5. • Light bends, or refracts,whenever it enters a newmaterial• White light that enters a prismcomes out separated into itscolors.• A rainbow appears in the skywhen light reflects and refractsin water droplets.
  6. 6. • An object in the path of light wavescasts a shadow.• The object casting the shadow blocksthe path of light.• A shadow is largerwhen the objectis closer to thelight source.
  7. 7. CONCAVE vs. CONVEXConvex Lens: A magnifyingglass contains a convexlens that bends light raysto make objects look larger.Concave Lens: A concavelens is thinner in the middlethan the edges. It can bendlight rays to make an objectlook smaller.
  8. 8. Electromagnetic Radiation–a combination of electrical and magneticenergy• Like sound, light travels in waves that havecertain wavelengths and frequencies.• Its speed is different in different materials.• Light can be reflected or absorbed by certainobjects, or it can pass through them.
  9. 9. Electromagnetic Radiation• Some types of electromagnetic radiation havewavelengths that are shorter than those ofvisible light.ex: ultraviolet, x-ray, & gamma ray radiation• Longer waves have lower frequencies andlower energies.ex: infrared waves, microwaves,& radio waves.
  10. 10. How Does Light Move?• Light travels the fastest in a vacuum.• It travels more slowly through materialssuch as air or water.• Moves in straight lines.• If it reflects off an object light still movesin a straight line but in a differentdirection.
  11. 11. • Light bends, or refracts,whenever it enters a newmaterial• White light that enters a prismcomes out separated into itscolors.• A rainbow appears in the skywhen light reflects and refractsin water droplets.
  12. 12. • An object in the path of light wavescasts a shadow.• The object casting the shadow blocksthe path of light.• A shadow is largerwhen the objectis closer to thelight source.
  13. 13. CONCAVE vs. CONVEXConvex Lens: A magnifyingglass contains a convexlens that bends light raysto make objects look larger.Concave Lens: A concavelens is thinner in the middlethan the edges. It can bendlight rays to make an objectlook smaller.

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