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Boundary Behaviour

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Boundary Behaviour

  1. 1. Waves Boundary Behaviour
  2. 2. Boundary Behaviour <ul><li>The behavior of a wave (or pulse) upon reaching the end of a medium is referred to as boundary behavior. When one medium ends, another medium begins; the interface of the two media is referred to as the boundary and the behavior of a wave at that boundary is described as its boundary behavior. </li></ul>
  3. 3. Fixed End Reflection <ul><li>Incident pulse </li></ul><ul><li>Reflected Pulse </li></ul><ul><li>Energy lost to pole </li></ul>
  4. 4. Fixed End Reflection <ul><li>What do you observe about: </li></ul><ul><li>The reflected pulse? </li></ul><ul><li>The speed of the reflected pulse? </li></ul><ul><li>The wavelength of the reflected pulse? </li></ul><ul><li>The amplitude of the reflected pulse? </li></ul>http://www. physicsclassroom .com/ mmedia /waves/fix.html
  5. 5. Free End Reflection <ul><li>What do you observe about: </li></ul><ul><li>The reflected pulse? </li></ul><ul><li>The speed of the reflected pulse? </li></ul><ul><li>The wavelength of the reflected pulse? </li></ul><ul><li>The amplitude of the reflected pulse? </li></ul>http://www. physicsclassroom .com/ mmedia /waves/free.html
  6. 6. Animation
  7. 7. Reflection from One Medium to Another <ul><li>Let's consider a thin rope (less dense) attached to a thick rope (more dense). </li></ul><ul><li>Upon reaching the boundary, the usual two behaviors will occur. What are they? </li></ul>
  8. 8. Reflection from One Medium to Another <ul><li>What do you observe about: </li></ul><ul><li>The reflected pulse? </li></ul><ul><li>The transmitted pulse? </li></ul><ul><ul><li>The speed of the reflected compared to the transmitted pulse? </li></ul></ul><ul><ul><li>The wavelength of the reflected compared to the transmitted pulse? </li></ul></ul><ul><ul><li>The speed and wavelength of the reflected pulse compared to the incident pulse? </li></ul></ul>http://www.physicsclassroom.com/mmedia/waves/ltm.html
  9. 9. Bondary Behaviour – Dense to Less Dense <ul><li>What do you observe about: </li></ul><ul><li>The reflected pulse? </li></ul><ul><li>The transmitted pulse? </li></ul><ul><ul><li>The speed of the reflected compared to the transmitted pulse? </li></ul></ul><ul><ul><li>The wavelength of the reflected compared to the transmitted pulse? </li></ul></ul><ul><ul><li>The speed and wavelength of the reflected pulse compared to the incident pulse? </li></ul></ul>
  10. 10. Summary <ul><li>the wave speed is always greatest in the least dense medium, </li></ul><ul><li>the wavelength is always greatest in the least dense medium, </li></ul><ul><li>the frequency of a wave is not altered by crossing a boundary, </li></ul><ul><li>the reflected pulse becomes inverted when a wave in a less dense medium is heading towards a boundary with a more dense medium, </li></ul><ul><li>the amplitude of the incident pulse is always greater than the amplitude of the reflected pulse. </li></ul>

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