Violin ;it is a stringed works according to the vibrations of the strings
flute ; it works according to the vibration of air flow through the air holes

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Sound note is produced in percussion instrument like drum , tabla , bongo,dhol etc is by striking or beating the surface which cause vibration of the surface which in turn produces the sound.
String based instrument like guitar produces it's sound by vibrating their string.
The pitch in string instrument depend on the thickness of the string, so guitar or other string based instrument have different thickness strings.