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Theory:

String instruments:
  • Stringed instruments like the guitar have string or wire to produce vibrations, and hence the specific sound is produced.
  • These instruments also have hollow boxes that amplify the sound that is produced.
  • The frequency of a sound wave is varied by varying the length of the vibrating string. Violin, Guitar, Sitar are some of the examples of stringed instruments.
  • A musical string has several frequencies at which it can vibrate naturally. These natural frequencies are known as the harmonics of the string.
  • The natural frequency at which an instrument vibrates depends upon the string's tension, the linear density of the string, and the length of the string.
German,_maple_Violin.jpg
Violin
 
guitar-musical-instrument-string-instrument-accessory-string-instrument-acoustic-guitar-plucked-string-instruments-1538417-pxhere.com (3).jpg
Guitar
  
Percussion instruments:
  • Percussion instruments produce a specific sound when they are struck, scrapped or clashed together. They are the oldest type of musical instrument.
  • There is a fantastic variety of percussion instruments all over the world.
  • Percussion instruments like the drum and tabla consist of a leather membrane stretched across a hollow box called the resonator. When a membrane is hit, it starts vibrating and produces sound.
carnival-color-instrument-musician-drum-musical-instrument-905672-pxhere.com.jpg
Drum
Reference:
https://commons.wikimedia.org/wiki/File:German,_maple_Violin.JPG
https://pxhere.com/en/photo/1538417