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German physicist Heinrich Hertz in 1887 built the first experimental spark gap transmitters during his historic experiments to demonstrate the existence of electromagnetic waves predicted by James Clerk Maxwell in 1864, in which he discovered radio waves, [23] [24]: p.3-4 [25] [17]: p.19, 260, 331–332 which were called "Hertzian waves" until ...
Heinrich Rudolf Hertz (/ h ɜːr t s / HURTS; German: [ˈhaɪnʁɪç hɛʁts]; [1] [2] 22 February 1857 – 1 January 1894) was a German physicist who first conclusively proved the existence of the electromagnetic waves predicted by James Clerk Maxwell's equations of electromagnetism.
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It is based on the photoelectric effect originally observed by Heinrich Hertz in 1887 and later explained by Albert Einstein in 1905 that when a material is shone by light, the electrons can absorb photons and escape from the material with the kinetic energy: =, where is the incident photon energy, the work function of the material.
1887 experimental setup of Hertz's apparatus. 1886 to 1888: After noticing how discharging an electric current into a coil produced a spark in a second nearby coil, Heinrich Hertz sees a way to build a test apparatus to solve von Helmholtz "Berlin Prize" problem.
In 1887, Heinrich Hertz observed the photoelectric effect [27] and reported on the production and reception [28] of electromagnetic waves. [29] The receiver in his apparatus consisted of a coil with a spark gap, where a spark would be seen upon detection of electromagnetic waves. He placed the apparatus in a darkened box to see the spark better.
HEMPT 3050 is a satellite station-keeping Ion thruster, currently selected for the use on German Heinrich Hertz satellite. It's designed to be used for two roles: orbit-rising and station-keeping . To date it's been demonstrated to operate over 9000 hours.
Experimental 300 MHz Barkhausen-Kurz oscillator in 1933, with Lecher line tank circuits. The experimenter is using a U-shaped Lecher wavemeter to measure the frequency Lecher line as a tank circuit in an RF amplifier. Not shown in this simplified diagram are the chokes that feed the tube anodes from the HT source.