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Waves G12

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A set of slides created to teach Waves G12 to learners at Bishops Diocesan College in Cape Town.

A set of slides created to teach Waves G12 to learners at Bishops Diocesan College in Cape Town.

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  • 1. Waves K Warne
  • 2. SAMPLE ONLY SAMPLE ONLY SAMPLE ONLY For FULL presentation click HERE >> www.warnescience.net Wave Speed
  • 3. SAMPLE ONLY SAMPLE ONLY SAMPLE ONLY For FULL presentation click HERE >> www.warnescience.net Double slit interference Two sets of coherent waves will interfere with each other producing INTERFERANCE patterns. This can be seen by allowing a set of waves to pass through a double slit. Nodal lines – destructive interference.
  • 4. SAMPLE ONLY SAMPLE ONLY SAMPLE ONLY For FULL presentation click HERE >> www.warnescience.net Single Slit Experiment  This experiment proves that light undergoes ……………………….., and hence LIGHT is a ……………... A thin rectangular piece of glass is painted with black paint, and a thin single slit is made on the paint with a razor blade.  White Light A beam of white light is shone through the slit.  Observation 1) A broad …………………….. of bright white light is observed. 2) This is flanked by alternate spectral ……………….. and black fringes.  What factors would affect the amount of diffraction?? How??
  • 5. SAMPLE ONLY SAMPLE ONLY SAMPLE ONLY For FULL presentation click HERE >> www.warnescience.net Hygen’s Principle  Every ………………… on the wave front acts as the ……………….. of a new wave.
  • 6. SAMPLE ONLY SAMPLE ONLY SAMPLE ONLY For FULL presentation click HERE >> www.warnescience.net Diffraction  Nodal lines appear in the diffracted waves. Light intensity NODE NODE ANTINODE
  • 7. SAMPLE ONLY SAMPLE ONLY SAMPLE ONLY For FULL presentation click HERE >> www.warnescience.net 1 Red light:  = 690 x 10-9 m a = 6.0 x 10-6 m and m = 1 sin  = (1)(690 x 10-9 )/(6.0 x 10-6)  = sin-1 (0.115)  = 6.60o 2 Blue light:  = 460 x 10-9 m a = 6.0 x 10-6 m and m = 1 sin  = (1)(460 x 10-9 )/(6.0 x 10-6)  = sin-1 (0.077)  = 4.40o Diffraction Questions Sin  = m a 1. Find the position of the first dark band formed on the screen when red light of wavelength 690 nm is passed through a slit of width 6.0 m. 2. Compare this with the position of the first order dark band when blue light of wavelength 460 nm is used. 6.60o 4.40o
  • 8. SAMPLE ONLY SAMPLE ONLY SAMPLE ONLY For FULL presentation click HERE >> www.warnescience.net Hi… This is a SAMPLE presentation only. My FULL presentations, which contain a lot more slides and other resources, are freely available on my resource sharing website: www.warnescience.net (paste into your browser if link above does not work) Have a look and enjoy! Keith Warne WarneScience