![]() ![]() ![]() One of the electrodes is prepared for the photoelectric effect, and is called the photocathode (a cathode is a source of electrons). The photoelectric effect experiments use a device called a photocell.Ī photocell is made of two "electrodes" (pieces of metal) inside of an evacuated glass bulb. Let's review the reasons why the photoelectric effect supports the postulate of quantization of electromagnetic energy in photons. The photoelectric effect occurs when light (visible or ultraviolet) shines on a metal.Įnergy from the light can cause electrons to be ejected from the surface of the metal. The photoelectric effect was the first clear demonstration that photons are real, not just a fudge. The energy of a photon of frequency f is E ph = hf.Īlthough Planck's resolution of the "ultraviolet catastrophe" for the blackbody radiation spectrum assumed that electromagnetic radiation is quantized in packets of energy we call photons, it was not understood if this was reality, or simply a coincidence of nature.Electromagnetic radiation quantized in packets called photons.Peak of blackbody spectrum: l maxT = 0.2898×10 -2m.K.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |