Unformatted text preview: 6a. (2 pts) The atomic number of ﬂuorine is 9. How many electrons are in a neutral atom
of 25F?
6b. (2 pts) How many neutrons are in the nucleus of 25F? 2 é C
60. (2 pts) How many protons are in the nucleus of 25F? / 6d (4 pts) Calculate the charge radius/ of 25F K j 215% (297/)? 3,57 6147
[ti/2‘; 34056;] 7a. (10 pts) Calculate the binding energy of 3He in MeV. (MH 2 1.007825 u, MN 2
1.008665 u, mme = 3.016029 u). M L/ ' ” C? )/
13/:= 22>; }, 007825‘7L A003é6> *3 (#5075444 7 [’13: : 7, 7,: Mr: t/ *4/21 .3 > m. 1/] 7b. (4 pts) What IS the binding energy per nucleon of 3He? f /f s 5, s 3 w 0%] 8a (10 pts) The mean lifetime of a nucleus is 7 seconds If one measures a counting rate
of 5500 counts/s at a certain time what will be the counting rate 11 seconds later? ,. , t _ (.12, 115/73 CC;
67: K106 //\C/: >7>00/»—) : ))/f3 ['— J J (t1 , I _A f
[a / f _. / 5 / 0 ) 
8b (10 pts) What is the half life of this nucleus? ZZJ/ 3' /n 7— ?/ (/bZ>/7>: [4114: 6’, '1 If 5] ...
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 Fall '09
 PROSPER

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