There is a good reason why the lamp contains only a small amount of mercury, which must be vaporized to support the lamp current and generate light. The electrons in the mercury atoms, which then emit ultraviolet The flow of electrons through the gases excites The filaments remain hot when the tube is lit producing They produce electrons that ionise the mercury atoms. Volts for tubes under 30 watts and 100 to 175 volts for tubes of 30Ī pair of electrode filaments are located at the The high speed electrons cause the mercury atoms to ionize.Īfter this has taken place, the voltage can lowered - as the initial ionisations produce more of the same. The initial high voltage burst is necessary to produce electrons with enough kinetic eergy to ionise the mercury atoms - the atoms in the gas need to be sparse enough (low pressure) so that KE can be built up to a level that will allow ionisation of the mercury atoms. The mixture of mercury and gas is not conductiveĪ high voltage discharge is needed to start Is made of glass and is narrow, with two electricalĬonnections on each of the metal caps that seal the ends of the tube.Ĭontains an inert gas (such as argon, neon,Ī tube with gases inside having a pressure of about Releases some of that energy in the form of visible light.The missingĮnergy is usually converted to thermal energy (infra red transitions), Source (like an interaction with a photon, or a collision with anotherĪtom) is promoted to a higher energy level and then, on 'falling back', Occurs when an electron in an atomic orbital absorbs energy from some A Level and AS level - UK KS 5 (Age 16 - 18).GCSE and 'O' Level - UK KS4 (Age 14 - 16).
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