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Why does it make different sounds?

I made a instrument for science and i have to describe why it makes the different notes and i cant figure it out

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if the instrument is based on strings, the tightness of the string and length of the string makes a certain vibration that causes sound.

if the instrument is based on contact, the material my create different sounds.

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I used three different types of nails and put them in a piece of wood i use another nail to run across them creating the sound but my teacher says i need to explain in scientific words why they make different sounds
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