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physics 202 test 4_2 - 3 A 8.5 g charcoal sample from an...

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Unformatted text preview: 3. A 8.5 g charcoal sample from an ancient fire pit has a ”C activity of 76.5 disintegrations/min. A living tree has a ”C activity of 15.3 disintegrations/min per 1.00 g of carbon. The half-life of NC is 5730 years. How old is the charcoal sample? in? “I _ ’ 673* : 1423' 1/11 éfi‘a: moeégm 1am amid; 3’83 95; rs ’k 51va : . v" 1‘ w ’ w :t (1 Re 6 jéfi 7 (9 70/55 {1.3oaéax/0‘” K #16 1 W335 fl : “2’5 4 ’ . 1 A K” 1—453?"— . 3:" ”/1 awe/01114 'Ifl/ ”$3:th , : %§ 71 ‘ I _ 2 ‘ I? Jp'sm‘ : t ?8 4 hour 4. )24Na decays to fiMg with a half life of 15.0 hours. a) 25-ng sample ofAz‘Na contains how many nuclei? 6 . _. b) What is the initial decay rate of the sample? c) Afier 48.0 hours how many “Na atoms remain in the sample? (1) lang/oflg At this time what Is the decay rate of the sample? 95* (0 "9 0M ég O “7 .1} 3; ‘jq {é/NWO” 1 a. ”£11.!51qw/0 ( c , o 9 .10 ) — “" flls’IWK/Ofl (may ‘ ‘ ’Y .... £5.42; qlqéggy/(j’g‘ Mflzwq— 1% 35, 1 d) 3, 79*(0 “fig-S" 1 We} '. . l5kr5;j¥i" 5' ““6qu _q J1. 3%‘éflal'3mfl 3 ’ W 10 6 ~qéQx/ n“ ‘1 «~— 00; PL 1 0 l: (1 {211? K )7; A gt 9:75; x/blfe—q. éRY/o'OK/a) 1 21,13 2A/ * L v [01‘ : 1/1] 56:8500’? y i181”: k} , ”0-5) 1 h ['fié1]:(na82exio[iiiff/ 02:» AW ”4% ...
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