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A sample of wood from an Egyptian mummy case gives a 14C count of 9.1 cpm/gC (counts per minute per gram of carbon) . How old is the wood? (The initial decay rate of 14C is 15.3 cpm/gC, and its half-life is 5730 years.)


A) 3.4 103 years
B) 4.3 103 years
C) 4.9 103 years
D) 1.9 103 years
E) 3.0 103 years

Correct Answer

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The U-238 nucleus decays to form Pb-206 by and decays. -Calculate the number of decays.


A) 2
B) 4
C) 6
D) 8
E) none of these

Correct Answer

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The Br-82 nucleus has a half-life of about 1.0 103 minutes. If you needed at least 1.6 g of Br-82 and had ordered 29 g of NaBr (assuming all of the Br in the NaBr was Br-82) , how many days could you wait for delivery?


A) 3.2 days
B) 1.2 days
C) 2.9 days
D) 2.6 days
E) 3.8 days

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Radioactive tracers are useful in studying very low concentrations of chemical species. A chemist has a sample of HgI2 in which part of the iodine is the radioactive nuclide of mass 131, so that the count rate is 5.0 1011 counts per minute per mole of I. The solid mercuric iodide is placed in water and allowed to come to equilibrium. Then 100 mL of the solution is withdrawn, and its radioactivity is measured and found to give 22 counts per minute. What is the molar concentration of iodide ion in the solution?


A) 1.1 10-11
B) 1.1 10-9
C) 1.1 10-10
D) 4.4 10-10
E) 4.4 10-11

Correct Answer

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The half-life of 90Sr is 28 years. How long will it take for a given sample of 90Sr to be 86% decomposed?


A) 3.4 101 years
B) 2.6 years
C) 3.3 102 years
D) 6.1 years
E) 7.9 101 years

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is an unstable isotope. Which radioactive decay would be expected? A) B) (<font face= symbol ></font>) C) fission D) (<font face= symbol ></font>) E) is an unstable isotope. Which radioactive decay would be expected?


A) is an unstable isotope. Which radioactive decay would be expected? A) B) (<font face= symbol ></font>) C) fission D) (<font face= symbol ></font>) E)
B) ()
C) fission
D) ()
E) is an unstable isotope. Which radioactive decay would be expected? A) B) (<font face= symbol ></font>) C) fission D) (<font face= symbol ></font>) E)

Correct Answer

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When the U-235 nucleus is struck with a neutron, the Ce-144 and Sr-90 nuclei are produced, along with some neutrons and beta particles. -How many neutrons are emitted?


A) 5
B) 6
C) 2
D) 3
E) 4

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The ratio of the atomic radius to the nuclear radius is approximately


A) 105
B) 10-5
C) 10-15
D) 102
E) 1015

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Which reaction will produce an isotope of the parent nuclide?


A) Which reaction will produce an isotope of the parent nuclide? A) <font face= symbol ></font> B) C) <font face= symbol ></font> D) E) 
B) Which reaction will produce an isotope of the parent nuclide? A) <font face= symbol ></font> B) C) <font face= symbol ></font> D) E)
C) Which reaction will produce an isotope of the parent nuclide? A) <font face= symbol ></font> B) C) <font face= symbol ></font> D) E) 
D) Which reaction will produce an isotope of the parent nuclide? A) <font face= symbol ></font> B) C) <font face= symbol ></font> D) E)
E) Which reaction will produce an isotope of the parent nuclide? A) <font face= symbol ></font> B) C) <font face= symbol ></font> D) E)

Correct Answer

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What is the most likely decay for the Co-62 nucleus?


A) positron emission
B) (-ray emission)
C) ( decay)
D) ( decay)
E) proton emission

Correct Answer

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When the Pd-106 nucleus is struck with an alpha particle, a proton is produced along with a new element. What is this new element?


A) Cd-109
B) Ag-108
C) Ag-109
D) Cd-112
E) none of these

Correct Answer

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The questions below refer to the following: Iron-56, The questions below refer to the following: Iron-56, , has a binding energy per nucleon of 8.79 MeV. (1 MeV = 1.60 <font face= symbol ></font> 10<sup>-</sup><sup>13</sup> J) -Determine the amount of energy needed to decompose 1 mol of iron-56 nuclei. A) 4.74 <font face= symbol ></font> 10<sup>13 </sup>J B) 3.47 <font face= symbol ></font> 10<sup>11 </sup>J C) 8.90 <font face= symbol ></font> 10<sup>11</sup> J D) 1.13 <font face= symbol ></font> 10<sup>14 </sup>J E) 7.75 <font face= symbol ></font> 10<sup>13</sup> J , has a binding energy per nucleon of 8.79 MeV. (1 MeV = 1.60 10-13 J) -Determine the amount of energy needed to "decompose" 1 mol of iron-56 nuclei.


A) 4.74 1013 J
B) 3.47 1011 J
C) 8.90 1011 J
D) 1.13 1014 J
E) 7.75 1013 J

Correct Answer

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The U-238 nucleus decays to form Pb-206 by and decays. -Calculate the number of decays.


A) 4
B) 2
C) 8
D) 6
E) none of these

Correct Answer

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Which of the following is a product of decay of Which of the following is a product of <font face= symbol ></font> decay of ? A) B) C) D) E) ?


A) Which of the following is a product of <font face= symbol ></font> decay of ? A) B) C) D) E)
B) Which of the following is a product of <font face= symbol ></font> decay of ? A) B) C) D) E)
C) Which of the following is a product of <font face= symbol ></font> decay of ? A) B) C) D) E)
D) Which of the following is a product of <font face= symbol ></font> decay of ? A) B) C) D) E)
E) Which of the following is a product of <font face= symbol ></font> decay of ? A) B) C) D) E)

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Radioactive elements decay via first-order kinetics. Consider a certain type of nucleus that has a rate constant of 1.6 10-2 h-1. A sample contains 7.9 108 radioactive nuclides. Calculate the time required for 63% of the nuclides to decompose.


A) 1.3 101 h
B) 1.3 10-1 h
C) 2.7 101 h
D) 2.9 101 h
E) 6.2 101 h

Correct Answer

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The stable nuclide The stable nuclide is formed from by a long series of <font face= symbol ></font> and <font face= symbol ></font> decays. Which of the following nuclides could not be involved in this decay series? A) Po-221 B) Pu-239 C) Tl-210 D) Ra-226 E) Pa-234 is formed from The stable nuclide is formed from by a long series of <font face= symbol ></font> and <font face= symbol ></font> decays. Which of the following nuclides could not be involved in this decay series? A) Po-221 B) Pu-239 C) Tl-210 D) Ra-226 E) Pa-234 by a long series of and decays. Which of the following nuclides could not be involved in this decay series?


A) Po-221
B) Pu-239
C) Tl-210
D) Ra-226
E) Pa-234

Correct Answer

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Which of the following balanced equations is labeled incorrectly?


A) beta production: Which of the following balanced equations is labeled incorrectly? A) beta production: B) bombardment: C) alpha production: D) fusion: E) fusion:
B) bombardment: Which of the following balanced equations is labeled incorrectly? A) beta production: B) bombardment: C) alpha production: D) fusion: E) fusion:
C) alpha production: Which of the following balanced equations is labeled incorrectly? A) beta production: B) bombardment: C) alpha production: D) fusion: E) fusion:
D) fusion: Which of the following balanced equations is labeled incorrectly? A) beta production: B) bombardment: C) alpha production: D) fusion: E) fusion:
E) fusion: Which of the following balanced equations is labeled incorrectly? A) beta production: B) bombardment: C) alpha production: D) fusion: E) fusion:

Correct Answer

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The half-life for electron capture for The half-life for electron capture for is 1.3 billion years. What will be the ratio in a rock that is 4.5 billion years old? A) 0.10 B) 0.091 C) 10. D) 11. E) 0.36 is 1.3 billion years. What will be the The half-life for electron capture for is 1.3 billion years. What will be the ratio in a rock that is 4.5 billion years old? A) 0.10 B) 0.091 C) 10. D) 11. E) 0.36 ratio in a rock that is 4.5 billion years old?


A) 0.10
B) 0.091
C) 10.
D) 11.
E) 0.36

Correct Answer

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If more than one neutron from each fission event causes another fission event, the fission situation is described as


A) supercritical.
B) critical.
C) moderated.
D) subcritical.
E) none of these

Correct Answer

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What is the most likely decay for the Fe-53 nucleus?


A) (-ray emission)
B) ( decay)
C) ( decay)
D) positron emission
E) two of these

Correct Answer

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