TL;DR for a lab report, how does the volume of a resonance chamber underneath the guitar string affect its sustain i.e. time it stays above a volume threshold x. Is there an equation to model this relationship?
For a physics Lab investigation for school, I decided to investigate the following question: How does the volume of a resonance chamber underneath a guitar string affect the time it stays above a volume threshold of x decibels when struck using a constant force?
In terms of the control variables: the thickness of the string, force the string is struck with, the pitch of the string... and a few others.
The independent variable would be the volume of the chambers, which I will adjust by having two boxes, where, one is in the other with their openings are facing each other. So, I cab adjust the volume by pulling them apart or closing in on them.
Finally, the dependent variable is the time the string will be above x decibels. I will measure this by keeping a mic next to the string at a constant distance and measuring its sound. I will start a timer once I strike the string, and stop it when the sound measured goes underneath x decibels.
I am unable to find any resources to help me with this. Could anyone explain the physics behind this, if there is any, and help me derive an equation to represent the relationship between my IV and DV?