The doppler effect

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The doppler effect

  1. 1. The Doppler EffectMay 20, 2013
  2. 2. Objectives1. Identify the Doppler effect2. Explain its cause and uses3. Understand the terms and cause ofSonic Boom
  3. 3. Doppler Effect Fire Engine Car Horn Change infrequency due tothe motion of thevibrating object
  4. 4.  The Doppler Effect
  5. 5. Sound Waves1. As an object moves towardyou, frequency seems shorter– higher pitch2. As an object moves away,frequency seems longer –lower pitch3. Never the speed that changes,just the frequency
  6. 6.  The Doppler Effect
  7. 7. Uses of the Doppler Effect Doppler Radar Police Radar
  8. 8. Wave Barrier and Bow Waves When the source is moving as fast asthe waves it produces it reaches a wavebarrier Once it passes its wave speed iscreates a V shaped pattern – Bow Wave
  9. 9. Shock Waves and SonicBooms Shock Waves – Form overlapping cones thatForm a V Sonic Boom – sharp crack heard whensupersonic aircraft’s shock waves pass
  10. 10.  The Sonic Boom Doppler Demos
  11. 11. Light Waves1. Red shift –frequency is lowertherefore red lightis seen2. Blue shift –frequency is highertherefore blue lightis seen
  12. 12. The Stars Scientists use this knowledge tomeasure the speed of rotation of thestars And the distance of galaxies

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