👉 Undersound is a concept in physics that describes a phenomenon where an object, such as a sound wave or a particle, does not resonate with a medium. This means that it cannot be perceived by the listener's ears, and therefore, it does not contribute to the overall perception of sound waves. In other words, an undersound can only be heard if the medium is not resonant with the sound wave itself. For example, a whisper or a soft humming sound are examples of undersounds
