Light Energy


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created for 5th grade science classroom

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Light Energy

  1. 1. Light Energy Vocabulary Notes
  2. 2. Light Energy • Light energy is electromagnetic radiation. This means it is a combination of electrical energy and magnetic energy. • Light energy is given off by electrons in an object. • Light moves in waves. • All light energy is in a spectrum that includes waves with different frequencies and wavelengths. • The light we see is only a tiny part of that
  3. 3. Absorption • Absorption of light occurs when an object does not reflect or transmit the light. • Black objects absorb all light and white objects absorb no light. • Whatever color or wavelength of light is absorbed, the opposite color is relfected. – Ex: An object that appears red is absorbing blue and green wavelengths.
  4. 4. Reflection • Reflection is when light bounces off an object. • Mirrors show reflection very well. • Again, an object that appears red is absorbing the blue and green wave lengths but is reflecting the red.
  5. 5. Transmission • The process in which light travels through a medium without being absorbed or scattered. • Light goes straight through the material.
  6. 6. Refraction • Refraction is the bending of light waves as they pass from one substance to another. • Light rays may bend as they move from one substance to another. • An illusion is created when light rays go from air into water and “bends” the pencil. • If light is transmitted “head-on” the direction does not change (no refraction). • If the light strikes at an angle it is
  7. 7. Scattering • Scattering of light is caused by light bouncing off an object in a bunch of different directions. • Scattering is caused by differences present in materials, which the light is striking. • This includes bubbles, droplets, surface roughness, and textile fibers in clothing. • This is what causes the sky to be blue.
  8. 8. The halo The sun is is from in the light middle of scattering the halo. in the ice crystals that make the cloud.
  9. 9. Transparent • Sometimes when light strikes matter, almost all the light gets through. – T r a n s p a r e n t materials allow light to pass through with almost no disturbance. – It may or may not color the light but you can clearly see objects through them. – Ex: glass
  10. 10. You can see straight through the glass window.
  11. 11. Translucent • Sometimes only some light gets through – T r a n s lu c e n t materials allow only part of the light to pass through, while also bouncing it in many new directions. – It gives you a blurry view but lets in light. – Example: a frosted glass door (like a shower door)
  12. 12. You can see through the frosted glass but the image is blurry.
  13. 13. Opaque • Sometimes no light gets through. – O p a q u e materials completely block light from passing. – Example: dark colored cardstock paper
  14. 14. You cannot see through the glass plates and bowl.