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Waves (Notes 1) - CP Physics


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  • Light and its nature have caused a lot of ink to flow during these last decades. Its dual behavior is partly explained by (1)Double-slit experiment of Thomas Young - who represents the photon’s motion as a wave - and also by (2)the Photoelectric effect in which the photon is considered as a particle. A Revolution: SALEH THEORY solves this ambiguity and this difficulty presenting a three-dimensional trajectory for the photon's motion and a new formula to calculate its energy. More information on
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Waves (Notes 1) - CP Physics

  1. 1. waves
  2. 2. definition A wave is a wiggle in space and time. A wave is an oscillation (a repeated disturbance).
  3. 3. what does the waving? 1. mechanical waves the wave disturbance occurs in a medium (substance) e.g., pressure disturbance in air (sound waves) disturbance of water surface (water waves) 2. electromagnetic waves require no medium e.g., light, x-rays
  4. 4. what direction is the waving done in? There are two directions associated with waves. 1. propagation direction Where the wave goes. Where the energy goes.
  5. 5. 2. oscillation direction The direction in which individual particles (or fields) move.
  6. 6. If propagation and oscillation are at right angles, it’s a transverse wave. propagation oscillation
  7. 7. wave on a string (PHeT) crowd doing the wave (video)
  8. 8. There were once water ripples on Mars.
  9. 9. Some bats can detect the ripples made by frogs when calling for mates. The ripples are like a target, with a juicy meal at the center!
  10. 10. Anatomy of a transverse wave wavelength
  11. 11. Anatomy of a transverse wave amplitude amplitude = vertical distance from center line to wave peak. Units: m
  12. 12. If propagation and oscillation are in the same direction, it’s a longitudinal wave. oscillation propagation
  13. 13. ancient video on sound slinky
  14. 14. Anatomy of a longitudinal wave high pressure low pressure compression = region of high pressure rarefaction = region of low pressure
  15. 15. Anatomy of a longitudinal wave compression wavelength rarefaction
  16. 16. pressure amplitude = maximum pressure – average pressure. average amplitude
  17. 17. the wave equation frequency = number of waves passing a fixed point each second. Symbol: f Units: Hz (“Hertz”)
  18. 18. the wave equation Let’s count the number of waves passing in 1 sec: t=0s t=1s 2.25 waves
  19. 19. the wave equation frequency = number of waves passing a fixed point each second. f = 2.25 Hz in the example from the previous slide.
  20. 20. the wave equation t=1s
  21. 21. the wave equation t=1s
  22. 22. the wave equation
  23. 23. the wave equation the wave equation
  24. 24. the wave equation