Test2wAns

Test2wAns - Name: For TA/Instructor Use Only. Problem #...

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Unformatted text preview: Name: For TA/Instructor Use Only. Problem # Points 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 TOTAL 1 Instructions Write your name in the given space. For problems 1 - 18, Circle the correct answer. For problems 19 - 25, Use the given space. Useful values: 1 u = 931 . 5 MeV hc = 1240 nm.eV electron mass = 0 . 511 MeV Planck constant h = 6 . 626 10- 34 J.s Speed of light c = 3 . 10 8 m.s- 1 Proton mass = 938 . 272 MeV Neutron mass = 939 . 566 MeV = 1.008665 u mass of 17 O = 16 . 999131 u mass of 16 O = 15 . 994915 u BE = C 1 A- C 2 A 2 3- C 3 Z ( Z- 1) A 1 3- C 4 ( A- 2 Z ) 2 A + C 5 A 1- 1 C 1 = 15 . 75 MeV , C 2 = 17 . 80 MeV C 3 = 0 . 711 MeV , C 4 = 23 . 70 MeV , C 5 = 11 . 18 MeV 2 Name: MP200 - Radiation Physics Fall 2010 Test 02 Date: 10/20/2010 ( Show your work for each problem. Partial credits may be awarded.) 1. The average binding energy per nucleon of the daughter nucleus in a decay process is, (a) greater than that of the parent nucleus (b) less than that of the parent nucleus (c) equal to that of the parent nucleus (d) none of the above Solution: (a) Unstable nucleus decays to be stable. Therefore daughter nucleus is more stable than the parent and the stable nucleus has greater binding energy. 2. Which one of the following quantities is not necessarily conserved in nuclear reactions? (a) electric charge (b) number of protons (c) linear momentum (d) angular momentum (e) number of protons and neutrons Solution: (b) number of protons all other quantities, charge,linear momentum, angular momentum, and nucleon number ( number of protons and neutrons) should be necessarily conserved in a nuclear reaction. 3 3. How many neutrons are produced in following nuclear reaction: 1 n + 235 92 U- 88 38 Sr + 136 54 Xe +? (a) 11 (b) 12 (c) 22 (d) 24 (e) 48 Solution: (b) 12 Assume number of neutrons to be x , then: 1 n + 235 92 U- 88 38 Sr + 136 54 Xe + x 1 n number of nucleons: 1 + 235 = 88 + 136 + x x = 12 4 4. which of the following equation is best represented by the graph? (a) x + y = a b (b) x- y = e 2 (c) ax 2 + by 2 = 0 (d) x + y = ab (e) y = ax b Solution: (E) log y = a + b logx y = 10 a x b y = ax b 5. Determine the atomic number Z and the nucleon number A in the following reaction: 3 2 He + 23 Z Na- A 12 Mg + 2 1 H Z A (a) 12 23 (b) 12 24 (c) 11 24 (d) 11 23 (e) 11 22 Solution: (c) Z = 11 A = 24 charge: 2 + Z = 12 + 1, Z = 11 5 and Nucleon number: 3 + 23 = A + 2, A = 24 6. The half-life of 200 79 Au is 2 . 88 10 3 s . What is the mass of a sample of 200 79 Au that has an activity of 1...
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Test2wAns - Name: For TA/Instructor Use Only. Problem #...

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