Pluck the string! Before plucking it again, change its tension by placing the weights one under the other and compare the sounds you could hear!

What is the relationship between the pitch (frequency) of the sound you could hear and the number of expanding weights?

A more expanded and more flexible string vibrates at a higher rate and gives as higher sound.
The frequency of the vibration increases with the expensive force, when the oscillations propagate faster in the string.

In sum, the speed of the wave (c) is a function of the expensive force (F), the cross-section (q) of the string and the density () of the string material.
The exact formula is