When it comes to waves on a string, what is the "source"

[September24]

I know that the formula for frequency for a wave on a string is nv/2L. For velocity is sqrt(T/U). However, I also know that frequency is a function of wave "source" while velocity is a function of medium. For medium, I know what should cause a change. For example, if string density of tension change, I understand that the "medium" is changing since the string is the medium, so if those things change, I know that velocity should increase or decrease.

However, what things should change frequency here? Will density or tension change cause a change in frequency as well? What is the source here?

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[Sammy1024]

I think in most questions, you're assuming that there's a machine that is causing a wave to travel at a certain frequency. However, in a question they would probably alter the velocity or wavelength and ask you to calculate the change in frequency.