Resonance does not happen very often and only affects object close to the vibrating source. Sometimes, the effects of resonance can be powerful. Changing Pitch A string vibrates with a particular fundamental frequency. It is possible, however, to produce pitches with different frequencies from the same string. When the length of a string is changed, it will vibrate with a different frequency.
Shorter strings have higher frequency and therefore higher pitch.
When a musician presses her finger on a string, she shortens its length. The more fingers she adds to the string, the shorter she makes it, and the higher the pitch will be. Diameter is the thickness of the string. Thick strings with large diameters vibrate slower and have lower frequencies than thin ones. This means that the thin string will sound one octave above the thicker one.