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P7 waves

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IGCSE physics waves presentation

IGCSE physics waves presentation

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P7 waves P7 waves Presentation Transcript

  • P7 WavesGeneral properties
  • Progressive waveThis is a wave that carries energy from oneplace to another place without transferring matter
  • Transverse waves http://www.acoustics.salford.ac.uk/feschools/waves/wavetypes.htm Mexican wave / slinky / particleshttp://www.science-animations.com/support-files/slinkyc.swfSpringhttp://www.upscale.utoronto.ca/GeneralInterest/Harrison/Flash/ClassMechanics/TravelWaves/TravelWaves.htmlTravelling wave View slide
  • In a transverse wave, the direction of the disturbance is at right angles to the direction of travel of the wave. View slide
  • Water waves are transverse waves
  • Displacement-distance graphs
  • The wave equation:The frequency f is the number of completewaves generated per second.
  • Example:
  • A wavefront is a line on which the disturbance has the samephase at all points; the crests of waves can be thought of aswavefronts.
  • Reflection
  • Refractionhttp://faraday.physics.utoronto.ca/PVB/Harrison/Flash/Waves/TwoMediums/TwoMediums.html depth effect on speed and on wavelengthhttp://faraday.physics.utoronto.ca/PVB/Harrison/Flash/Waves/Refraction/Refraction.html change in speed effect on direction
  • Waves travel more slowly in shallow water.
  • The spreading of waves at theedges of obstacles is called: Diffraction http://www.acoustics.salford.ac.uk/feschools/waves/diffract3.htm
  • Wave theory
  • Explaining reflection
  • Explaining refraction
  • Transverse vs Longitudinal WavesIn a progressive longitudinal wave the particles ofthe transmitting medium vibrate to and fro along thesame line as that in which the wave is travelling andnot at right angles to it as in a transverse wave.