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Ch. 18 - Waves & Sound. III. Music Music vs. Noise Resonance Harmonics Interference Acoustics. A. Music vs. Noise. Music specific pitches and sound quality regular pattern Noise no definite pitch no set pattern. B. Resonance. Forced Vibration

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ch 18 waves sound
Ch. 18 - Waves & Sound

III. Music

  • Music vs. Noise
  • Resonance
  • Harmonics
  • Interference
  • Acoustics
a music vs noise
A. Music vs. Noise
  • Music
    • specific pitches and sound quality
    • regular pattern
  • Noise
    • no definite pitch
    • no set pattern
b resonance
B. Resonance
  • Forced Vibration
    • when one vibrating object forces another object to vibrate at the same frequency
    • results in a louder sound because a greater surface area is vibrating
    • used in guitars, pianos, etc.
b resonance4
B. Resonance
  • Resonance
    • special case of forced vibration
    • object is induced to vibrate at its natural frequency
b resonance5
B. Resonance

“Galloping Gertie”

The Tacoma Narrows Bridge Disaster

Wind through a narrow waterway caused the bridge to vibrate until it reached its natural frequency.

c harmonics
C. Harmonics
  • Fundamental
    • the lowest natural frequency of an object
  • Overtones
    • multiples of the fundamental frequency
d interference

Constructive - louder

Destructive - softer

D. Interference
  • Interference
    • the ability of 2 or more waves to combine to form a new wave
d interference8
D. Interference
  • Beats
    • variations in sound intensity produced by 2 slightly different frequencies
    • both constructive and destructive interference occur
e acoustics

Anechoic chamber - designed to eliminate reverberation.

E. Acoustics
  • Acoustics
    • the study of sound
  • Reverberation
    • echo effect produced by the reflection of sound