Science Buddies: "Ask an Expert"

Hi I'm doing this experiment trying to find out which musical intervals lead to the strongest sympathetic vibrations, the vibration that occurs when one plucked string sets off a vibration on one or more unplucked strings because of the soundboard of the guitar. Why and how are nodes and antinodes, which are the fixed points of the strings, an important part in making the strings vibrate? I already know that each vibrational mode has fixed ends of the string which are the nodes and antinodes, but how are they used to make the strings vibrate, and why are they a major factor in how sympathetic vibrations occur?

A node is the point of a wave where the amplitude of the wave is a minimum. An antinode is the point of a wave where the amplitude of the wave is a maximum. On a guitar string, the ends of the string are the nodes. The frets along the length of the string allow the string length to be shortened, by changing the position of the nodes, which produces different notes. I hope the links below will help in your further research.

http://en.wikipedia.org/wiki/Node_(physics)

http://en.wikipedia.org/wiki/Sympathetic_resonance

Thanks for the feedback! It really helped me understand more about nodes and antinodes and how they relate to sympathetic vibrations!