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Students know visible light is a small band within a very broad electromagnetic spectrum

6a. Students know visible light is a small band within a very broad electromagnetic spectrum. PHYSICAL PRINCIPLES IN LIVING SYSTEMS . Physical principles underlie biological structures and functions 7 th grade CA Life Science Standards. Light. 5. 4. 3. Energy. 6563 Å photon. 2.

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Students know visible light is a small band within a very broad electromagnetic spectrum

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  1. 6a • Students know visible light is a small band within a very broad electromagnetic spectrum

  2. PHYSICAL PRINCIPLES IN LIVING SYSTEMS Physical principles underlie biological structures and functions 7th grade CA Life Science Standards

  3. Light

  4. 5 4 3 Energy 6563 Å photon 2 Hydrogen Absorption

  5. 5 4 Energy 3 6563 Å photon 2 Hydrogen Emission

  6. Hydrogen Atom 5 4 -e 434 nm 3 2 656 nm -e 1 -e +P 486 nm 410 nm -e -e 400 nm 700 nm

  7. Emission andAbsorption Lines • Lines come from electron transitions • Energy change either comes from (absorption) or is given to (emission) photon. E • Photon energy  Frequency • E = hf • Frequency  1/(Wavelength) • f = c/l • Wavelength means COLOR

  8. Brackett (Far IR) Paschen (IR) 4 3 Balmer (VIS) 2 1 Lyman (UV) Hydrogen Spectrum Energy

  9. Aluminum Argon Calcium Carbon Helium Hydrogen Iron Krypton Magnesium Neon Nitrogen Oxygen Sodium Sulfur Xenon

  10. Demo: Spectral Emission Tubes

  11. Demo: Flame Test

  12. EM Spectrum

  13. Uses of EM Radiation

  14. ROYGBIV

  15. Demo UV & Geology

  16. Demo- Visualizing UV

  17. 6b • Students know that for an object to be seen, light emitted by or scattered from it must be detected by the eye.

  18. Retina - Photoreceptors

  19. Optical Light Benches

  20. 6c • Students know light travels in straight lines if the medium it travels through does not change.

  21. 6d • Students know how simple lenses are used in a magnifying glass, the eye, a camera, a telescope, and a microscope.

  22. Ray Diagram - Microscope

  23. 6e • Students know that white light is a mixture of many wavelengths (colors) and that retinal cells react differently to different wavelengths.

  24. Red/ Green/ Blue

  25. Cyan / Yellow

  26. 6f • Students know light can be reflected, refracted, transmitted, and absorbed by matter.

  27. Reflection of visible light

  28. Reflection – ray diagram

  29. Demo – Reflection (Lasers)

  30. Refraction

  31. Demo: Refraction

  32. Demo – Laser refraction

  33. Demo – Refraction in Prism

  34. Absorption of Light by Plants

  35. Absorption Spectrum - Photosynthesis

  36. 6g • Students know the angle of reflection of a light beam is equal to the angle of incidence.

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