Sound Waves

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Sound Waves

  1. 1. 1. A wave is a disturbance that carries through matter or empty space. A. matter B. particles C. energy D. a medium E. water 2. Electromagnetic waves . A. are transverse waves B. require a medium C. are mechanical waves D. are longitudinal waves E. are tortional 3. Waves that require or travel through a medium are called . A. longitudinal waves B. transverse waves C. mechanical waves D. tortional waves E. all of the above 4. For which type of waves do particles in the medium vibrate perpendicular to the direction in which the wave is traveling? A. transverse waves B. longitudinal waves C. P waves D. all of the above E. None of the above
  2. 2. ReviewReview  Mechanical waves  Electromagnetic waves  Transverse waves  Longitudinal waves  Characteristics of waves
  3. 3. SoundSound  Is a longitudinal wave  Needs a medium to travel through  The source of a sound wave vibrates rapidly
  4. 4. SoundSound  This causes pressure vibrations  Which causes air molecules to vibrate
  5. 5. SoundSound  Air molecules bunch together in some places  Compressions  Spread out at other places  Rarefactions
  6. 6. PitchPitch  How high or how low a sound is  Not how loud  Depends on the frequency  Faster the frequency, the higher the pitch
  7. 7. PitchPitch  Low pitch  High pitch Same amplitude, different frequency
  8. 8. LoudnessLoudness  Depends on the amplitude  Higher amplitude, louder sound
  9. 9. LoudnessLoudness Quiet Loud Same frequency, different amplitude
  10. 10. EchoEcho  Sound waves that bounce off a surface  Sound will reflect off hard surfaces  They will be absorbed by soft surfaces
  11. 11. ResonanceResonance  When two objects naturally vibrate at the same frequency

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