Tightening the string.
The high e.
Pluck the string with your finger or with anything (like a pick or the hammer of a piano) and it will cause the string to vibrate at a frequency which is determined by the thickness of the string and the length of the string (which is a fixed length on a piano, but is determined by where you fret (push down on with your fingertip) the string on instruments like guitars and violins. The frequency of the vibration determines the note... since sound IS vibration.
The A string frequency is 440Hz
If the fundamental is 440 Hz, then the second harmonic is 880 Hz.
loosen the string
Three parts - 1.) Is the fundamental frequency, 2.) determines the pitch of the musical note sounded, and 3.) has one antinode.
It depends: the frequency of what? For example, in the case of a string moving back and forth, that would depend on the length of the string, on its mass, and on its tension.
The first harmonic, is the fundamental frequency, or 550 Hz. The second harmonic would be twice that, or 1100 Hz. The third would be twice that, or 1650 Hz and so on...
When an object with periodic motion has a string and the string is shortened, the frequency would be smaller/reduced.
The A string is the second string and the second thickest string.
Tightening the string will make its' frequency higher.
Tightening the string will increase the sound frequency.