At 2430 (1887) Hertz has noticed that when light with a short wavelength, high frequency surface effects. fell, or metal. To make the particles with a charge leapt from the metal. This phenomenon is called dielectric Toh fo event appear (photoelectric effect) because it is a phenomenon that involves both light and electricity. Later, in 2441 (1898) Thomson measured the ratio between electric charge per mass of particles emitted from the metal and found that there are the same electron emitted from the cathode, it is believed that particles are electrons and electron call it as four-Electron (photoelectron)
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