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7th Grade Chapter 5 Lesson 2
 

7th Grade Chapter 5 Lesson 2

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    7th Grade Chapter 5 Lesson 2 7th Grade Chapter 5 Lesson 2 Presentation Transcript

    • Pgs. 159-167 For Student Use Only 7 th Grade Chapter 5 Lesson 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
    • Key
      • 1) A,B,C,D
    • 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
    • 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
    • Parts of the waves:
      • Student generated ideas:
      • What parts of the waves are listed in the pictures?
    • 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
    • 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
    • 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
    • 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
    • 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
    • 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
    • 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
    • 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