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