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7th Grade Chapter 5 Lesson 2
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7th Grade Chapter 5 Lesson 2

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  • 1. Pgs. 159-167 For Student Use Only 7 th Grade Chapter 5 Lesson 2
  • 2. Question 1 What is the atmosphere good for?
    • A. Protect life from radiation from the sun
    • C. Keep temperatures constant
    • B. Contain enough oxygen
    • D. Disperse water throughout the world
  • 3. Key
    • 1) A,B,C,D
  • 4. Waves are everywhere
    • Student generated ideas:
    • How are the 2 pictures related?
    • 1. Tyler, Sanitago, Matthew- sun has rays which are like waves and the water has waves
    • 2. Katy, Katlyn- sun has heat waves you can feel and water has ripples after you touch it
  • 5. Waves are everywhere
    • Waves
      • Waves carry energy
      • Waves need a medium to travel through- (any substance) called a wave medium
      • Electromagnetic Wave-
        • Made of electric and magnetic fields
        • Fields vibrate back and forth
    http://www.astronomynotes.com/light/emanim.gif
  • 6. Parts of the waves:
    • Student generated ideas:
    • What parts of the waves are listed in the pictures?
  • 7. Waves are everywhere
    • Parts of Waves:
      • Wave Pulse: a single rise or depression in a series of waves
      • Crest- high point of wave
      • Trough- lowest point of wave
      • Wave Train- series of waves
      • Frequency- number of complete waves that pass a given point at a certain time
      • Wavelength- distance from one crest to another crest
    http://www.astronomynotes.com/light/emanim.gif
  • 8. Waves are everywhere
    • Student generated ideas:
    • How many of these waves do you use everyday?
    http://www.hermes-program.gr/img/figures/emrinfo_1_en.jpg
  • 9. Waves are everywhere
    • Types of Electromagnetic Waves:
      • Infrared Rays: caused by higher amounts of energy- we sense as heat
      • Radio Waves: FM, AM (short-band) or VHF (VERY high frequency)
      • Microwaves: lower portion of radio waves (RADAR senses this)
      • Ultraviolet: higher frequency
  • 10. Waves are everywhere
    • Types of Electromagnetic Waves:
      • Flourescent- turns UV light into visible light (think florescent lights)
      • X-rays: high frequency rays and can penetrate many materials
      • Gamma Rays: extremely energetic can be dangerous
  • 11. Waves are everywhere
    • Student generated ideas:
    • How many of these waves do you think are screened by the sun?
    http://www.hermes-program.gr/img/figures/emrinfo_1_en.jpg
  • 12. Waves are everywhere
    • Electromagnetic Waves from Sun:
      • Most radiation (99%) from the sun is in the optical window
        • Windows are bands of frequencies
          • Radio and Optical Window
      • Atmosphere stops much radiation
  • 13. Waves are everywhere
    • Layer of the atmosphere:
    • Thermosphere- hottest region
    • Ionsphere- found in thermosphere and mesosphere and has a high concentration of positive
    • Stratosphere- home to ozone layer
      • Ozone Layer- is made of O 3 that is turned into O 2 when energy hits it
    http://ds9.ssl.berkeley.edu/lws_gems/3/images_3/layat510.jpg
  • 14. Waves are everywhere
    • Reflected Radiation:
    • 50% of suns energy reaches earth reaches Earth
      • ON EARTH:
        • 47% absorbed by sun
        • 3% is reflected off Earth into space
      • IN ATMOSPHERE:
        • 25% absorbed by atmosphere
      • Atmosphere:
        • 25% reflected immediately into space
    http://ds9.ssl.berkeley.edu/lws_gems/3/images_3/layat510.jpg