final - 1 , I I @ Winter 2006--'---- r '-7- Physics 14...

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Unformatted text preview: 1 , I I @ Winter 2006--'---- r '-7- Physics 14 FINAL-- PART 1: ANSWER ALL QUESTIONS SHOW ALL YOUR WORK AND REASONING Question 1: (2 pts) What is an alpha particle? .. ~, QJJJw...'NJ~1 ~\~d b~ fA cU~ ~ JlcJJN.. \ ~, ~,~J 10:; ~ d.J.~ ~~ V\A.1L.~J (J ..J What is a beta particle? fOO Question 2: (3 pts) A friend gives you a box in which is a radioactive sample and asks you to open it in 12 hours. The sample has a half-life of 2 hours. When you open the box and analyze the sample, you have just 25 grams of the radioactive isotope present. What was the original mass of the radioactive isotope? ? '2tv L Lv ' 2S;j ,- ~QS <_\w \ 00 ~ c.-- :?aoj' ' If(X::) ~ 2~4 ~ ; LL J \ ( >", ~ j ':~ ()~ ) h),,~_-- ') () v... 3 Question 3: (2 pts) What isotope do you get if a helium nucleus (42He)and a carbon nucleus C26C) are fused together? J 1 y- 12 I " 2-/-J~ + (. C. "::0 J 8?J Do you get energy out from this process or does it "cost" you energy. Explain. Physics 14- FINAL- Winter 2006- Page 2 Question 4: (2 pts) What are the different leptons? 2- " MfJOf\ ~ ~~')'" ~ ~ . ~{~~~\~~ Question 5: (5 pts) The energy levels of an atom are shown below. The ground state of the atom (E1)is shown and is NOT zero energy. An electron is in the third excited state, with energy E4= 12.5 eV. (An "eV" is just a unit of energy, like a joule, just smaller.) electron a) How could the electron have gotten to the third excited state? ~g.f~" 0. rM~ ~ 4 ~ 1'2.->- ~.r ~ IJ:J..-t;j c) Which emitted photon has the highest frequency? b) What are ALLthe possible enerqies of the E1=0.5 eV I (grouncNilate) photons that can be emitted as the electron returns to the ground state? 'l." 3 2: If.OfV " l.13.: b d} _s Lf-i2: .eV 2. I .. ,)eV JlJ pj If J . 12-0" 3 I " Ct.S e. V Physics 14- FINAL - Winter2006- Page 3 Question 6: (1 pt) a) Plutonium e4't94PU) decays into uranium (24092U ). What is the decay process: alpha, beta, or gamma?...
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This note was uploaded on 02/10/2011 for the course PHYS 14 taught by Professor Physcs14 during the Spring '09 term at Santa Monica.

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final - 1 , I I @ Winter 2006--'---- r '-7- Physics 14...

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