Ch Waves & Sound III. Music Music vs. Noise Resonance Harmonics

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Presentation transcript:

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 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. Resonance Resonance special case of forced vibration object is induced to vibrate at its natural frequency

The Tacoma Narrows Bridge Disaster 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 Fundamental the lowest natural frequency of an object Overtones multiples of the fundamental frequency

D. Interference Interference the ability of 2 or more waves to combine to form a new wave Constructive - louder Destructive - softer

D. Interference Beats variations in sound intensity produced by 2 slightly different frequencies both constructive and destructive interference occur

Anechoic chamber - designed to eliminate reverberation. E. Acoustics Acoustics the study of sound Reverberation echo effect produced by the reflection of sound Anechoic chamber - designed to eliminate reverberation.