P5f Nature Of Waves

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P5f Nature Of Waves

  1. 1. P5f Nature of waves
  2. 2. P5f - Nature of waves Interference of waves Constructive Destructive
  3. 3. Revision - Diffraction <ul><li>Diffraction is… </li></ul><ul><li>Maximum diffraction happens when… </li></ul>
  4. 4. What if there are 2 gaps?
  5. 7. Diffraction patterns <ul><li>When waves are ____________ by two slits they overlap which causes _____________ </li></ul><ul><li>_______________ interference cancels the waves out leaving blank spaces </li></ul><ul><li>_______________ interference builds the waves up causing bright patches </li></ul>
  6. 8. Diffraction of light <ul><li>Light is ________________ radiation with a very ________ wavelength (400-700 nm) </li></ul><ul><li>Light waves can be ____________ when they pass through very small gaps (50  m) and can _____________ when they overlap </li></ul>Draw the laser diffraction pattern you saw in the box above
  7. 9. Diffraction of light
  8. 10. You can stick you ‘rainbow’ here
  9. 11. Path difference <ul><li>Path difference is the difference in how far the waves have traveled </li></ul><ul><li>Even number of 1/2 wavelengths = constructive </li></ul><ul><li>Odd number of 1/2 wavelengths = destructive </li></ul>
  10. 12. Polarisation <ul><li>Light waves are an example of ____________ waves </li></ul><ul><li>Not only do the go up and down, they also go ______ to ______ and in all other directions </li></ul>
  11. 13. Polarisation - Polarising filters
  12. 14. Polarising filters <ul><li>Polaroid plastic polarises light so that only the vibrations in either the __________ or the ___________ direction are allowed to pass </li></ul><ul><li>If two polarising filters are crossed then… </li></ul>
  13. 15. Polarisation - 3D movies

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