6a

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6a

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

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PHYSICAL PRINCIPLES IN LIVING SYSTEMS

• Physical principles underlie biological
  structures and functions
• 7th grade CA Life Science Standards

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Light
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(No Transcript)
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Hydrogen
Absorption
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Hydrogen
Emission
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Hydrogen Atom
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4
-e
434 nm
3
2
656 nm
-e
1
-e
P
486 nm
410 nm
-e
-e
700 nm
400 nm
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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

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Hydrogen Spectrum
Energy
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Aluminum
Argon
Calcium
Carbon
Helium
Hydrogen
Iron
Krypton
Magnesium
Neon
Nitrogen
Oxygen
Sodium
Sulfur
Xenon
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Demo Spectral Emission Tubes
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(No Transcript)
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Demo Flame Test
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EM Spectrum
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Uses of EM Radiation
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ROYGBIV
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Demo UV Geology
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Demo- Visualizing UV
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6b

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

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Retina - Photoreceptors
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Optical Light Benches
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6c

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

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6d

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

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Ray Diagram - Microscope
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6e

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

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Red/ Green/ Blue
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(No Transcript)
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Cyan / Yellow
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(No Transcript)
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6f

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

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Reflection of visible light
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Reflection ray diagram
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Demo Reflection (Lasers)
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Refraction
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Demo Refraction
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Demo Laser refraction
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Demo Refraction in Prism
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Absorption of Light by Plants
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Absorption Spectrum - Photosynthesis
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6g

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