What is Doubochinski's pendulum?
[[File:SCHEMATIC OF THE DOUBOCHINSKI PENDULUM.png|thumb|Fig.1. Schematics of the Doubochinski’s pendulum]] [[File:FIRST FOUR QUANTIZED AMPLITUDES OF DOUBOCHINSKI PENDULUM.png|thumb|Fig.2. First four quantized amplitudes of Doubochinski’s pendulum at a magnetic field frequency f=50Hz. Electromagnet is located at the bottom of the pendulum.]] '''Doubochinski's pendulum''' is an experiment with an [[oscillator]] and a [[magnet]]. The most simple case is that of a [[pendulum]] that interacts with an oscillator. The pendulum (with a magnet at the end) will swing at a [[frequency]] of one swing per period of 1-2 seconds. A stationary [[electromagnet]] is placed under the equilibrium point of the pendulum. The electromagnet is then supplied with an [[alternating current]] of a fixed frequency, of between 10 and 10.000 [[Hertz|Hz]]. When the pendulum is released at any location, its movement will then evolve to stop at a height which depends on the frequency of the current of the electromagnet. This phenomenon was first discovered by the brothers Danil and Yakov Doubochinski in 1968–69.<ref>Tennenbaum, Jonathan 2005. Amplitude quantization as an elementary property of macroscopic vibrating systems. ''21st Century Science & Technology''. [http://www.21stcenturysciencetech.com/2006_articles/Amplitude.W05.pdf]</ref> == References == {{reflist}} {{physics-stub}} [[Category:Pendulums]]