THEUNIVERSITY OFHONGKONGBACHELOROFSCIENCE : FINAL EXAMINATIONRADIOISOTOPE UNIT: (87202) RADIATION PROTECTIONMay 7, 19982:30 - 4:30p.m.(i)Answer 4 outof5 questions. Questionno.1 (short answer questions)iscompulsory. Start each ofthe 4 questionsona new page.(ii)Questionno.1 carries 40 marks. Other 4 questions carry20marks each.(iii) Candidates may use any self-contained, silent, battery-operated and pocket-sized calculator. Thecalculator should have numeral-display facilities only and shouldbeused only for the purposesofcalculation. ltisthe candidate's responsibilitytoensure that his calculator operates satisfactorily.(iv)Candidates must record the name and typeoftheir calculatorsonthe front page of their examinationscripts.(Timeallowed:2 hours)1. (A) Briefly describe the classification of lasers and the possible hazards related to each class.(B) Whatisthe maximum magnetic intensityina plane electromagnetic wave which carries amaximum electric field intensityof10 Vm·1? Whatisthe power densityofthis wave?
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Magnetic Field,Ionizing radiation,radioactive waste,Inverse-square law,Nuclear reactor technology