Sound and music Contents: Sound 101 Beats Overtones and music.

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Beats and Music Contents: Beats Overtones and music.

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Sound and music Contents: Sound 101 Beats Overtones and music

Sound is longitudinal waves in matter: We can hear 20 Hz - 20,000 Hz (demo test tone generator) Most sound is more than one frequency (demo fft) Show harmonics with guitar TOC

Sound 101 Speed of sound in air at sea level: v = (331 + .60T) m/s, T = temperature in oC Speeds of sound at 20 oC and 1 ATM: Air 343 m/s Helium 1005 m/s Water 1440 m/s Steel 5000 m/s Sound underwater - Leonard Natatorium Sound in bones Demo -The finger bells TOC

The Speed of sound increases with temperature: Speed of sound in air at sea level: v = (331 + .60T) m/s, T = temperature in oC Example 1 – What is the speed of sound at 20 oC? 42 oC? v = (331 + .60(20 oC)) = 343 m/s v = (331 + .60(42 oC)) = 356 m/s

Speed of sound 1 | 2 | 3 | 4 TOC

What is the speed of sound in air at 80 oC? v = (331 + .60T) m/s v = 331 + .60(80) = 379 m/s W 379 m/s

At what temperature in Celsius is the speed of sound 318 m/s? v = (331 + .60T) m/s 318 = 331 + .60T T = -21.7 oC W -21.7 oC