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Chapter 15 – Sound
All sounds are caused by vibrations ,[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],The Human Voice
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Source of Sound in Instruments
Sound waves are longitudinal  
Sound waves travel faster as medium it travels through becomes warmer. ,[object Object]
Loudness Vs. Intensity ,[object Object],[object Object],[object Object]
Intensity ,[object Object],[object Object]
Sound waves that enter your ear cause the eardrum to vibrate. ,[object Object]
Frequency and Pitch   ,[object Object],[object Object],[object Object]
Reflection of Sound Waves ,[object Object],[object Object],[object Object],[object Object],[object Object]
Diffraction   ,[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],The Human Ear
Diagram of the Ear
[object Object],[object Object],Quality of Sound
Music   ,[object Object]
[object Object],[object Object],[object Object],BEAT
Beats are formed by the interference if two waves of slightly different frequencies traveling in the same direction.  In this case one beat occurs at T-2 where constructive interference is greatest. BEAT (continued)
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],BEAT (continued)
[object Object],[object Object],[object Object],Dissonance Vs. Consonance
The frequency of vibration is called the  fundamental frequency  of a vibrating string.  Because frequency is inversely proportional to wavelength and because we are considering the greatest possible wavelength, the  f undamental frequency  is the slowest vibration which produces the lowest pitch. Fundamental Frequency = F 1  = V/wavelength = V/2L Fundamentals
[object Object],[object Object],[object Object],Harmonics
First through Fifth Harmonics
[object Object],[object Object],[object Object],[object Object],NOISE
Acoustics   ,[object Object]
[object Object],[object Object],[object Object],[object Object],Works Cited
the end

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Sound

  • 2.
  • 3.
  • 4.
  • 5. Sound waves are longitudinal  
  • 6.
  • 7.
  • 8.
  • 9.
  • 10.
  • 11.
  • 12.
  • 13.
  • 15.
  • 16.
  • 17.
  • 18. Beats are formed by the interference if two waves of slightly different frequencies traveling in the same direction. In this case one beat occurs at T-2 where constructive interference is greatest. BEAT (continued)
  • 19.
  • 20.
  • 21. The frequency of vibration is called the fundamental frequency of a vibrating string. Because frequency is inversely proportional to wavelength and because we are considering the greatest possible wavelength, the f undamental frequency is the slowest vibration which produces the lowest pitch. Fundamental Frequency = F 1 = V/wavelength = V/2L Fundamentals
  • 22.
  • 23. First through Fifth Harmonics
  • 24.
  • 25.
  • 26.