In investigating guitar strings, what is the primary investigative phenomenon being explored by the students?

The students are primarily exploring guitar string sounds and vibrations in their investigation. This focus allows them to understand how different characteristics of the guitar strings, such as length, thickness, and tension, affect the sounds produced when the strings are plucked or strummed. By engaging with the sounds and vibrations, students can grasp fundamental concepts in physics, such as frequency and amplitude, which are crucial for understanding sound waves. This hands-on experience provides a direct connection to the principles of sound production, making it a crucial aspect of their inquiry rather than just considering the investigation's questions or analyzing the data they collect.