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Sound and waves

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Published

DAV Lecture (9/14/2013)

DAV Lecture (9/14/2013)

Published in Education , Technology , Business
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Transcript

  • 1. WAVE INTERACTIONS
  • 2. Amplitude- is the maximum distance the particles in a wave vibrate from their rest positions. Frequency - the number of waves produced in a given time
  • 3. Waves transfer energy without transferring matter. Frequency= waves/time
  • 4. II. Properties of Sound
  • 5. Pitch -description of how high or low the sound seems to a person . Loudness- how loud or soft a sound is perceived to be.
  • 6. Loudness of Sound in Decibels Sound Loudness (dbs) Hearing Damage Average Home 40-50 Loud Music 90-100 After long exposure Rock Concert 115-120 Progressive Jet Engine 120-170 Pain
  • 7. Ultrasound - sound waves with frequencies above the normal human range of hearing. Sounds in the range from 20-100kHz Infrasound - sounds with frequencies below the normal human range of hearing. Sounds in the 20-200 Hz range
  • 8. Doppler Effect is the apparent change in the frequency of a sound caused by the motion of either the listener or the source of the sound.
  • 9.  Sounds from Moving Sources.Sounds from Moving Sources.  A moving source of sound or a movingA moving source of sound or a moving observer experiences an apparent shift ofobserver experiences an apparent shift of frequency called thefrequency called the Doppler Effect.Doppler Effect.  If the source is moving as fast or faster thanIf the source is moving as fast or faster than the speed of sound, the sound waves pilethe speed of sound, the sound waves pile up into a shock wave called a sonic boom.up into a shock wave called a sonic boom.  A sonic boom sounds very much like theA sonic boom sounds very much like the pressure wave from an explosionpressure wave from an explosion
  • 10. Supersonic FlightSupersonic Flight
  • 11. Resonance the frequency of sound waves exactly matches the natural frequency of an object.
  • 12. Water Waves
  • 13. Tsunami Wavelength, 500 to 600 km in ocean