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Introduction to Waves

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Introduction to Waves

  1. 1. Intro to Waves
  2. 2. Waves Around Us • Water • Sound • Earthquake (seismic waves) • Light • Color
  3. 3. What is a Wave? • A spread of disturbance that carries energy • A type of harmonic motion (repeats itself)
  4. 4. Medium • Material a wave travels through – Particles in medium vibrate b/c of waves energy but don’t move Ex)Water is a medium for water waves Ex) Metal is medium for when a slinky is shaken
  5. 5. • Waves travel faster through: 1. Solids 2. Colder objects **** When molecules are closer together
  6. 6. • Energy travels through particles in the wave and causes objects to travel in a circular motion
  7. 7. Propagate • Way waves travel from a single point – Energy decreases with distance from starting point
  8. 8. Types of Waves 1. Transverse Waves • Vibration is perpendicular to the direction of wave travel • Ex) water waves, electromagnetic waves
  9. 9. 2. Longitudinal Waves (or Compressional) • Vibration is parallel to the direction of wave travel • Ex) sound
  10. 10. Cycle – repeated part of motion that starts and ends in same spot doing the same thing
  11. 11. Term Meaning Units Crest high point of wave   Trough low point of wave   Amplitude height of wave (m) Wavelength Length of a cycle, Distance between points (m) Frequency # of cycles in 1 sec Hertz (Hz) Period time for 1 cycle (sec) Wave Speed distance/time (m/s)
  12. 12. Parts of a Wave
  13. 13. Wave Equation
  14. 14. Ex) The speed of sound is 330m/s. If the wavelength of sound was 4m, what was the frequency of the sound? v = f λ 330 = f (4) f = 330/4 = 82.5 Hz
  15. 15. T & f Relationship T = 1 f T and f are inverse of one another
  16. 16. Example) Frequency = 5 Hz, find period T = 1/f T = 1/5 T = 0.2 s Example) Period = 10s, find frequency f = 1/T f = 1/10 f = 0.10 Hz

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