Germicidal lamps are used to sterilize tools in
Chapter 29, Problem 68(choose chapter or problem)
Germicidal lamps are used to sterilize tools in biologicaland medical fac ilities. One type of germicidal lamp is a lowpressure mercury discharge tube, simi lar to a nuorescent lightbulb,that has been optimized to emit ultraviolet light with awavelength of 254 nm. A 15-mm-diameter, 25-cm-long tubeemits 4.5 W of ultraviolet light. The mercury vapor pressureins ide the tube is 1.0 Pa at the operating temperature of 40C.a. On average, how many ultraviolet photons does each mercuryatom emit per second?b. The lifetime of the excited state in mercury is a rather long120 ns. On average, what fraction of its time does a mercuryatom spend in the excited state?
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