LogFAQs > #964057971

In the sense of "do they cause whatever medium they're existing in to vibrate"? I'd say yes. Despite their small size, moving through that medium and colliding with other things is still going to cause waves to form and propagate through that medium, albeit very small ones that will dissipate almost immediately because of how little energy is involved in creating them. In the sense of "can humans hear them"? Almost absolutely not. I'm sure it's not impossible to create equipment that could detect and amplify those waves to such an extent that humans could hear them, but that's going to be an extremely involved process with little to no actual value to justify the immense cost.