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Day109 28 Feb2008 Waves


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Day109 28 Feb2008 Waves

  1. 1. Thursday February 28 Day 109 <ul><li>Schedule </li></ul><ul><ul><li>Wrap Up Waves Today </li></ul></ul><ul><ul><li>Pre-Quiz HW </li></ul></ul><ul><ul><li>Review Tomorrow </li></ul></ul><ul><ul><li>Unit Test Monday </li></ul></ul><ul><ul><li>25 Week MP Ends March 5 </li></ul></ul>
  2. 2. Terminology <ul><li>Monochromatic Light </li></ul><ul><ul><li>Light Of A Single Color (Frequency) </li></ul></ul><ul><ul><li>Lasers Are Monochromatic </li></ul></ul><ul><li>Polychromatic Light </li></ul><ul><ul><li>Many Colors (Frequencies) </li></ul></ul><ul><ul><li>Sunlight Appears “White” Because Of How Our Eyes Respond To A Mixture Of Colors Across The Spectrum Of Visible Light </li></ul></ul>
  3. 3. Light As A Wave <ul><li>In Our Final Unit Of The Year, We Will Learn That Light Has Both WAVE PROPERTIES And PARTICLE Properties </li></ul><ul><li>In Other Words, Sometimes Light Behaves As A Wave, Sometimes As A Particle </li></ul><ul><li>In This Unit, We Have Only Considered The Wave Properties </li></ul><ul><li>Let’s Summarize </li></ul>
  4. 4. Light As A Wave <ul><li>Evidence That Light Behaves As A Wave </li></ul><ul><ul><li>It Has A Wavelength We Can Measure </li></ul></ul><ul><ul><li>Its Frequency Can Be Measured </li></ul></ul><ul><ul><li>It Reflects Like A Wave </li></ul></ul><ul><ul><li>It Refracts Like A Wave </li></ul></ul><ul><ul><li>It Diffracts Like A Wave </li></ul></ul><ul><ul><li>It Exhibits Constructive And Destructive Interference </li></ul></ul><ul><ul><li>It Can Be Polarized </li></ul></ul>
  5. 5. Polarization <ul><li>Recall This View Of An Electromagnetic Wave, Such As A Light Wave </li></ul>
  6. 6. Polarization <ul><li>Most Light Sources Are Not Light This </li></ul><ul><li>They Normally Consist of Waves In A Variety of Orientations </li></ul><ul><li>This Is How They Would Look In A Head-On and an Oblique View </li></ul>
  7. 7. Polarization <ul><li>We Can Simplify This Complex View Into A Wave With Half Of Its Waves Oriented Horizontally And Half Vertically </li></ul><ul><li>Here Is A Head-on View Of Simplified UNPOLARIZED Light </li></ul>
  8. 8. Polarization <ul><li>When A Wave IS POLARIZED, One Of The Orientations Is Blocked </li></ul><ul><li>One Material That Can Do This Is A Polaroid Filter </li></ul>
  9. 9. Polarization <ul><li>A Picket Fence Analogy Can Be Used </li></ul>
  10. 10. Polaroid Material
  11. 11. Polarizing Sunglasses <ul><li>Link To Animation </li></ul>
  12. 12. Homework <ul><li>Waves Pre-Quiz </li></ul><ul><ul><li>Pay Special Attention To Part II Questions (#64-#80), Including Measuring and Constructing Reflected and Refracted Rays </li></ul></ul><ul><ul><li>Use Your Written Notes </li></ul></ul><ul><ul><li>Use Posted Class Notes </li></ul></ul><ul><ul><ul><li>First Day Of Waves Was January 29 </li></ul></ul></ul><ul><ul><li>Use Your Reference Tables </li></ul></ul>