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Stringed Instruments (Ex. Guitars, pianos, violins)  Vibrating the string sets up a standing wave, the vibration from the string resonate the sounding.

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Presentation on theme: "Stringed Instruments (Ex. Guitars, pianos, violins)  Vibrating the string sets up a standing wave, the vibration from the string resonate the sounding."— Presentation transcript:

1 Stringed Instruments (Ex. Guitars, pianos, violins)  Vibrating the string sets up a standing wave, the vibration from the string resonate the sounding board of the instrument. The sounding board has more surface area and it creates the sound we hear.

2 Standing Wave  If we get a periodic wave on a string with a fixed end at the appropriate frequency we can create a Standing Wave  ~A wave that looks life its standing still Pluck!

3 Standing Wave  If we get a periodic wave on a string with a fixed end at the appropriate frequency we can create a Standing Wave ~A wave that looks life its standing still

4 Terminology  Nodes- points on the standing wave where there is no vibration.  There is maximum destructive interference at this point.  Antinodes- points on a standing wave with the most vibration.  There is maximum constructive interference at this point.

5 Changing the frequencies (notes) on a string  For the same note at a different octave you can force a different harmonic.  You can change the note by changing the length of the string or velocity of the wave on a string.  Velocity depends on the material, thickness, and tension of the string.  Length can be changed with your finger.

6 Fundamental frequency on a stringed instrument  fundamental frequency is the lowest natural frequency.  so it would look like this The second harmonic would look like this The third harmonic would look like this


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