I am new to learning about the physics of sound, resonance, resonant frequency, and standing waves. Most of the sources I am reading describe the effect of a single frequency on an object when that frequency matches the resonate frequency of the object.
For example, in the video in the link below, the man sets the tone generator to 337hz. This is the resonate frequency of the wine glass. At a certain volume the sound breaks the glass. https://www.youtube.com/watch?v=BE827gwnnk4
What I am having a hard time finding is information on the effect of multiple frequencies on a single object.
For example: 440hz is a concert pitch A and 528.01hz is the C which is a minor third above the A. What happens to an object whose resonate frequency is 440hz and both 440hz and 528.01hz frequencies are played simultaneously in a similar scenario to what was done in the video?