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

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

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

7. Hydrogen Atom 434 nm 656 nm 486 nm 410 nm -e -e -e -e -e 400 nm 700 nm2
656 nm -e 1 -e +P
486 nm
410 nm -e -e
400 nm
700 nm

8. Emission and Absorption 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

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

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

11. Demo: Spectral Emission Tubes

13. Demo: Flame Test

14. EM Spectrum

15. Uses of EM Radiation

16. ROYGBIV

17. Demo UV & Geology

18. Demo- Visualizing UV

19. 6b
Students know that for an object to be seen, light emitted by or scattered from it must be detected by the eye.

20. Retina - Photoreceptors

21. Optical Light Benches

22. 6c
Students know light travels in straight lines if the medium it travels through does not change.

23. 6d
Students know how simple lenses are used in a magnifying glass, the eye, a camera, a telescope, and a microscope.

24. Ray Diagram - Microscope

25. 6e
Students know that white light is a mixture of many wavelengths (colors) and that retinal cells react differently to different wavelengths.

26. Red/ Green/ Blue

28. Cyan / Yellow

30. 6f
Students know light can be reflected, refracted, transmitted, and absorbed by matter.

31. Reflection of visible light

32. Reflection – ray diagram

33. Demo – Reflection (Lasers)

34. Refraction

35. Demo: Refraction

36. Demo – Laser refraction

37. Demo – Refraction in Prism

38. Absorption of Light by Plants

39. Absorption Spectrum - Photosynthesis

40. 6g
Students know the angle of reflection of a light beam is equal to the angle of incidence.