Serway_CP_poll_ch29

Serway_CP_poll_ch29 - Approximately how many radioactive...

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present in a tritium sample with an activity of 0.4 x 10 -6 Ci and a half-life of 12.3 years? (1 Ci = 3.7 x 10 10 decays/s) 1 2 3 4 25% 25% 25% 25% 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 1. 13 x 10 7 2. 7 x 10 8 3. 3 x 10 10 4. 8 x 10 12
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What is the binding energy per nucleon of Au -197 (atomic number = 79)? (The following information regarding atomic masses will be needed: Au -197 , 196.966560; hydrogen, 1.007825; neutron, 1.008665; also 1 u x c 2 = 931.5 MeV) 1 2 3 4 25% 25% 25% 25% 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 1. 7.3 MeV 2. 7.7 MeV 3. 7.9 MeV 4. 8.3 MeV
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Approximately how many half-life periods must elapse if the activity of a radioactive isotope sample is to be reduced to 0.004 of the original value? 1 2 3 4 25% 25% 25% 25% 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 1. 3 2. 6 3. 8 4. 60
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proportion of its original radioactivity will a sample have after 9 years? 1 2 3 4 25% 25% 25% 25% 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 1. 0.55 2. 0.60 3. 0.73 4. 0.84
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The activity of a newly discovered radioactive isotope reduces to 96% of its original value in an interval of 2 hours. What is its half-life? 1 2 3 4 25% 25% 25% 25% 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 1. 10.2 hrs 2. 34.0 hrs 3. 44.0 hrs 4. 68.6 hrs
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If there are 128 neutrons in Pb -210 , how many neutrons are found in the nucleus of Pb -206 ? 1 2 3 4 25% 25% 25% 25% 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 1. 122 2. 124 3. 126 4. 130
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to account for which basic conservation laws during the beta decay process? 1 2 3 4 25% 25% 25% 25% 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 1. conservation of energy 2. conservation of momentum 3. both of the choices are valid 4. none of the choices are valid
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A radioactive isotope which emits a gamma quantum will change in what respect? 1 2 3 4 25% 25% 25% 25% 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 1. atomic number increases by one 2. atomic number decreases by one 3. atomic mass number decreases by one 4. none of the choices are valid
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A radioactive isotope which emits an alpha particle will change in what respect? 1 2 3 4 25% 25% 25% 25% 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 1. atomic number decreases by four 2. mass number decreases by four 3. both atomic number and mass number decrease by four 4. none of the choices are valid
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Tritium has a half-life of 12.3 years. How many sample diminishes to 10% of its original value? 1 2 3 4 25% 25% 25% 25% 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 1. 31 years 2. 41 years 3. 84 years 4. 123 years
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A pure sample of Ra-226 contains 2.0 x 10 14 atoms of the isotope. If the half-life of Ra -226 = 1.6 x 10 3 years, what is the decay rate of this sample? (1 Ci = 3.7 x 10 10 decays/s) 1 2 3 4 25% 25% 25% 25% 1 2 3 4 5 6 7 8 9 10 11
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This note was uploaded on 01/19/2010 for the course PHYS 200 taught by Professor Davies during the Spring '08 term at Roger Williams.

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Serway_CP_poll_ch29 - Approximately how many radioactive...

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