On Mon, Oct 12, 2020 at 11:12 AM Jones Beene <[email protected]> wrote:
> > > The appearance of higher amplitude sound waves could seem, at first, like > a path to net gain. > > Dicke "superradiance is involved as well as Fermi-Pasta-Ulam > > > https://en.wikipedia.org/wiki/Fermi%E2%80%93Pasta%E2%80%93Ulam%E2%80%93Tsingou_problem > > Could this mean that under the right conditions a body could unexpectedly radiate more of its energy in the infrared region? Harry > > H LV wrote: > > > Acoustic demonstration of beats > https://www.youtube.com/watch?v=IYeV2Wq82fw > > This is not mentioned in the video but beats also arise and persist in a > driven oscillator when no damping force is present. This happens because > the driver`s frequency does not match the natural frequency of the > oscillator. Beats will also initially appear in a driven oscillator when a > damping force is present but they will fade away quickly. > > Harry > > > >
