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h133_1094_6_key - H133 1094 Session 6 ‘1"may...

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Unformatted text preview: H133: 1094 Session 6 ‘1 "may; Sir/rite: your name and answers on this Sheet and 1mm! 5! in a: The? end. After the indicated time, move on to the next activity, even if you are not finished! 1. Group Warm—Up Problems [10 minutes] a. Do Q12T.7 and Q13T.l. [Give briDef explanations] _ ‘ s l «9 ’ , J 3 ‘ ‘ \ A, , , “\ a; *\ ©111th \ a "W x9; so smog \Ms \5 ioQMio/Wfiu “$0”ng “‘W ’t Q “infifim (N661) 50 \yfl‘g (6’) emf; , r 7 @333; ~‘ '5 The page; Wm :6 we“ we?) SON oan '=\>»~:vp:\.-ias 7;; in SO Rh?“ revues A? \5 N ‘5», J b. In your body, are there more neutrons or protons. More protons or electrons? Explam. ‘ l r “\‘W‘h 1?” fl; mg: mm“ w €VfiN‘Wg 2 “Wu O“~)°&q \C’Otbofi \, 8-1" otdwm NW» " 4. m ),_1__ “Come “mos? womb“- ‘5’fi. ‘:::*?f1.§og\e MONK WK 0:“ Maxim Qisz will 901» am a: xex’TCAJVS‘glmO—‘ié ‘ We J» 19- mm)? \‘s wafsiffim \ ‘w‘W-S/S‘m wmpWs a swm a Qt VI a -‘\ ‘ "L7,. \ \;\ “‘5 Tn‘,‘ A1,," \\ j, ‘3, 5 ‘ A. ~ 7 \ _ i“? " @m” M" $0.11, 5' [\‘J g L“ \D‘ "' _Q 0‘ .«CJ 93C” .JXQ/‘p‘w J“ \USQS‘F 3705‘s} Ml? \"1C.)l““&:‘- J‘gitjxg; <3 c. Do Q13T .5 and Q13T.6. [G1ve brlef explana‘nons] egg / (g A_ N??? W \ 5 c l --J ‘ we ‘ g4» ax. ~ ,_... "l: P l E)” ‘ 1 ‘ N k ,4, 3 ‘ a \ < n i _ , a. '\ 1 - g‘ ,. _» «V ’- ix * (‘3‘ \ ‘ ’ \ “9 V >$UMM i‘. L235 CHV‘X‘V‘J‘) \ ED kw" {\V’RQ I}, , w, , CZETxlD l~ Rim},ch (\7 Qoox :3, \ng lgmfiwa \ S‘s Q13“) 05QWWQG‘U 1‘0 l V. /‘_r U. I 2. Q1451 Decay Rates [10 minutes] a. Consider problem Ql4T.7. First, What is the "half-life" (see page 256) in this case? What is the answer to the problem? [BONUSzfiUsing (Q1431) and (Q1429), how many undecayed nuclei are there at t : 30 minutes?] Jog-Va 3; 5y, I Sb 356??? l 1539 figs-(jig i t a: 1 q 3 fl " ,10 “FM t d bf) St: lem’ , l 3 Km 3 new 9 (sixes : 1.5% a l b. Do prol§lemQ314T9 (Hint: After how much time would you expect the relative abundance tobeaone— half of that in living tissue?) , \ \ N \ . ‘= ‘ N - . ‘ bigé QOBBB‘ ‘96st ‘wNfi The milk ll) '1‘; 5% liv‘iml\s3m. a, J 22 Q , 3. Beta Decay Physics [15 minutes] a. Both 22Mg and 22O are unstable. Predict how they will decay until they reach a stable nucleus (using the "box" model of the nucleus). Note What particles (e.g., electron) are emitted .\ ‘ ,_ \ ' ~ 1 r a TM 1x) a lit-«ll ) 61 Q g M m M‘ ‘9“, 5) 3 ‘ J M"~/‘ 935 5° {Elmo‘s} -’,7?’\1N3\% (Talk <15 in ON (7M1) _ gm“ 71—”.‘3 «P‘s ‘7 fly..- w’ I, _ h K x ‘ ‘ A r + (33 W h . “\ T r41”; . W m ()(‘\\’\L(‘,‘\ ‘3 ' €43“ ) «J 0 JAM) ‘ PM on owl) 0&3") 0W“: W179 . ! “"“iw‘, » pal ‘ _ 1.. 3 - d l w; ‘ Nash-en but)? n9) pita i}; mg ‘3 [0N i eém mm, "9' n" b. Check your predictions: go to http://www.physics.ohio—state.edu/~ntg/Hl33/hl33_applets.php and follow the "Beta Decay" link. Try to account for incorrect predictions. ' TU“ Q 3 ' Q, t { ,_r“_~ x.) n”~”v3 , _v c. Do problem Q1385. \yex 298,?) ~ 0: Usel- -Uct r) ——d9 (9’33) /fi. /er;c»wg€m % 0N3 ms) N (Boomigs b3?) Z 0h?) ()1, E N @930”: my: £0333be WQ‘U\S)® 50 how v A Q? ZaN mriis‘r‘rufii muss Cyfifiéf‘ geumngrg) Sb fibv ”\ ’J’ , m . ‘- v» . , DJ? my?) may." two)» do.) mum 5i Sta-CM (Sb co”) . d. A radioactive nucleus can emit a position, e+. This corresponds to a proton in the nucleus being converted to a neutron. The mass of a neutron, however, is greater than that of a proton. How then can positron emission occur? 4} 2 34%;,“ m mimic ovfifiajs is {vow/1}) 3% up Ma .5 A )4 \r pm (523% cm swan e. Z changes in beta decay processes but A is constant. Explain how to find, for a given A, an expression for the most stable 2. (Note: How do you account for the neutron weighing more than the ) 7‘ proton?) % UQ‘WA m SQSEW EH ‘1 x an limb).ch may: rormtugr Res N marrow W 3"“ W New its-mm; MT KW?) worm in‘il) v: in 4. Rutherford Scattering [10 minutes] Start up the PhET applet "Rutherford Scattering". The simulation is of the famous experiment of Geiger and Marsden, in which they scattered alpha particles from nuclei. At the time, physicists didn‘t know for sure where the protons in the atom were located (neutrons weren't discovered until 1932). Two models were the "Rutherford Atom" and the "Plum Pudding Atom". In the latter, protons were spread evenly through the volume of the atom, rather than being concentrated in a small volume (the nucleus). a. What is the force that deflects the alpha particles? Qbfiwmb RQO\ 5mm ballot-i. 3‘. WM 30 in ‘rrx‘ O\\ pocTrngQ ooi) nude. v.5, b. Look at both the Plum Pudding and Rutherford atoms models. Sela/r} "sfer zrmw”for aims. What should observers in the laboratory measure to distinguish the models? (Remember that they don't see into the atoms!) fixes-fore, offith 0A9 u ,. a E» \ x \ -.. 93v Q“ 5‘»; \mv 09M be N521 \‘ .r ‘ 0. Why are there no large deflectionsin the plum pudding model (the simulation won't show (mg-r deflections)? g (‘7‘ \ \ \ X I sir—in ha first) or “0‘!- vrre mounds form-57 AVE) ‘ gbcui \E} 5\‘(\Q\\\\\ ‘ d. List two adjustments you can make in the simulation to make the alphas in the Rutherford Atom approach closer to the nucleus. [BONUS (do this if you have time at the end): Determine quantitatively the maximum energy for the alpha particle in the simulation] Shaun‘ch Clifi'"«ii ‘iiwil‘vox be lit number of Proloos in lit { , ...
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