Sound wave


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this is simple study for sound

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Sound wave

  1. 1. Dr.AidaSOUND WAVE
  3. 3. Longitudinal Wavewave particles vibrate backand forth along the path thatthe wave travels.Compressional Wave
  4. 4.  Compressions The close together part of the wave Rarefactions The spread-out parts of a wave
  5. 5. Transverse waveswave particles vibratein an up-and-down motion.
  6. 6. Crests Highest part of a waveTroughs The low points of the wave
  7. 7. Amplitude-is the maximum distancethe particles in a wavevibrate from their rest positions.Frequency- the number of wavesproduced in a given time
  8. 8. Frequency= waves/time
  9. 9. Wave Velocity - is the speed with which awave crest passes by a particular point inspace It is measured in meters/second.Wave Velocity = Frequency Wavelength
  10. 10.  Medium velocity m/sec air (20 C) 343 air (0 C) 331 water (25 C) 1493 sea water 1533 diamond 12000 iron 5130 copper 3560 glass 5640
  11. 11. II. Properties of Sound
  12. 12. Pitch- description of how high or lowthe sound seems to a person. Loudness-how loud or soft a sound isperceived to be.
  13. 13. Sound Loudness (dbs) Hearing DamageAverage Home 40-50Loud Music 90-100 After long exposureRock Concert 115-120 ProgressiveJet Engine 120-170 Pain
  14. 14. Ultrasound- sound waves with frequencies above thenormal human range of hearing. Sounds in the range from 20-100kHzInfrasound- sounds with frequencies below the normal human range of hearing.Sounds in the 20-200 Hz range
  15. 15.  the result of two or more sound waves overlapping
  16. 16. Different sounds that you hear include(A) noise, (B) pure tones, and (C) musicalnotes.
  17. 17. Doppler Effectis the apparent change in the frequency of a sound caused by the motion of either the listeneror the source of the sound.
  18. 18.  Sounds from Moving Sources.  A moving source of sound or a moving observer experiences an apparent shift of frequency called the Doppler Effect.  If the source is moving as fast or faster than the speed of sound, the sound waves pile up into a shock wave called a sonic boom.  A sonic boom sounds very much like the pressure wave from an explosion
  19. 19. Resonancethe frequency of sound wavesexactly matches the natural frequencyof an object.
  20. 20. Wave length, 500 to 600 km in ocean
  21. 21.  On December 26, they were playing in the sea when Tilly suddenly found the water was bubbling, like on top of a beer. She immediately realized tsunami was coming because the scene reminded her of a geography lesson about Hawaiis 1946 tsunami. Right away, Tilly told her parents, sister and other tourists to escape quickly, but at first they were in half belief. However, seeing Tillys serious and firm expression, people started to be convinced of the seriousness of the thing and instantly left the beach. At last over 100 tourists were ended up in safety with no death
  22. 22. THANK YOUDr.Aida
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