From a resting state, a guitar string will begin to ring as I resonate my vocal chords. If I make a fairly loud, and high-frequency "oo" sound at 440hz, then the A string on my guitar begins to vibrate and I get a nice A note.
I assume they both (vocal chord and guitar string) vibrate with the same sort of fundamental frequency (p.s. I'm self taught in comp. sci, I never went to college and never did this stuff in highschool... anywho!), however I’d more like to understand why one specifically induces the other. Is this simply due to the air distortion taking advantage of a taught string’s potential energy? If so, why doesn’t my voice resonate all strings, no matter what the note that my “oo” sound is effectively making? Why doesn't an overdriven, incredibly loud, electric guitar rupture my vocal chords whilst they are idle?
I'd like to add that my use of the word "resonate" may be less informed than most. I really mean "emits sound from vibration". Again, I am a total dilettante here.