Question 1

The ratio of the numbers of neutrons to protons in the nucleus of naturally occurring isotopes tends to vary with atomic number in what manner?

Accepted Answer

A)  increases with greater atomic number
B)  decreases with greater atomic number
C)  is maximum for atomic number = 60
D)  remains constant for entire range of atomic numbersE) A) and D)
F) All of the above

Question 2

The isotope 14C cannot be used in dating old samples of which of the following?

Accepted Answer

A)  charcoal from a fire
B)  a bronze implement from a cave
C)  a bone buried in mud
D)  All of the above can be dated using 14C.E) B) and D)
F) B) and C)

Question 3

An alpha particle (mass = 6.68 × 10−27 kg) is emitted from a radioactive nucleus with a kinetic energy of 4.55 MeV.How fast is the alpha particle moving in m/s? (1 MeV = 1.6 × 10−13 J)

Accepted Answer

A)  3.84E+3 m/s
B)  1.48E+7 m/s
C)  1.04E+7 m/s
D)  3.82E+7 m/s
E)  ​5.11E+6 m/sF) A) and B)
G) All of the above

Question 4

Two nuclei collide,one originally at rest,in an endothermic nuclear reaction with Q = −2.05 MeV.Which of the following describes the minimum kinetic energy needed in the reactant nuclei for the reaction is to occur?

Accepted Answer

A)  equal to 2.05 MeV
B)  greater than 2.05 MeV
C)  less than 2.05 MeV
D)  exactly half of 2.05 MeVE) B) and D)
F) C) and D) B

Question 5

Tritium has a half-life of 12.3 years.How many years will elapse when the radioactivity of a tritium sample diminishes to 35% of its original value?

Accepted Answer

A)  1.2E-1 years
B)  1.9E+1 years
C)  4.3E+0 years
D)  6.3E+1 years
E)  ​8.1E+0 yearsF) A) and D)
G) C) and E)

Question 6

There are samples of two different isotopes,X and Y.Both contain the same number of radioactive atoms.Sample X has a half-life twice that of Y.How do their decay rates compare?

Accepted Answer

A)  X has a greater rate than Y.
B)  X has a smaller rate than Y.
C)  The rates of X and Y are equal.
D)  The rate depends on atomic number,not half-life.E) A) and C)
F) A) and B)

Question 7

If the sum total mass of reactants in a nuclear reaction is greater than that of product particles,then which of the following statements best describes the conditions of the reaction?

Accepted Answer

A)  reaction is exothermic
B)  reaction is endothermic
C)  atomic number of each reactant must be greater than 40
D)  atomic number of each reactant must be less than 80E) A) and B)
F) All of the above

Question 8

Tritium has a half-life of 12.3 years.What proportion of its original radioactivity will a sample have after 2 years?

Accepted Answer

A)  0.01
B)  0.89
C)  0.37
D)  0.16
E)  ​0.25F) A) and B)
G) A) and C)

Question 9

Chromium-55 (54.940 8 u) emits an electron leaving a daughter nucleus of manganese-55 (54.938 0 u) .How much energy is released in this reaction? (1 u = 931.5 MeV/c2)

Accepted Answer

A)  5.59 MeV
B)  2.61 MeV
C)  1.40 MeV
D)  0.70 MeVE) C) and D)
F) All of the above

Question 10

Neglecting recoil of the gold nucleus,how much kinetic energy must an alpha particle (charge = 2 × 1.6 × 10-19 C) have to approach to within 5.70 × 10−14 m of a gold nucleus (charge = 79 × 1.6 × 10−19 C) ? (ke = 8.99 × 109 N⋅m2/C2 and 1 MeV = 1.6 × 10−13 J)

Accepted Answer

A)  4.4E-10 MeV
B)  1.1E+1 MeV
C)  2.0E+0 MeV
D)  4.0E+0 MeV
E)  ​5.0E-2 MeVF) B) and D)
G) B) and E)

Question 11

An ancient building was known to have been built 3 000 years ago.Approximately what proportion of Carbon-14 atoms are yet in the building's wooden framing compared to the number which were present at the time of its construction? (half life of 14C = 5 730 years)

Accepted Answer

A)  0.425
B)  0.500
C)  0.517
D)  0.696E) B) and C)
F) A) and D)

Question 12

When radium-224 emits an alpha particle,the remaining daughter nucleus is which of the following?

Accepted Answer

A)  lead-213
B)  actinium-215
C)  radon-220
D)  bismuth-215E) C) and D)
F) All of the above

Question 13

In the four radioactive series,the nuclei decay by either emitting alpha particles or beta particles until they reach the stable end product.Each decay,therefore,results in a mass number change of either 4 (for alpha decay) or 0 (for beta decay) .The radium isotope 226Ra is in one of these series.What is the starting isotope in the series containing 226Ra?

Accepted Answer

A)  238U
B)  235U
C)  232Th
D)  237NpE) A) and B)
F) All of the above

Question 14

1 Bq = ________ Ci?

Accepted Answer

A)  1
B)  106
C)  2.7 × 10-11
D)  3.7 × 1010E) A) and B)
F) None of the above C

Question 15

What particle is emitted when 240Pu decays to 236U? (atomic numbers of Pu and U are,respectively,94 and 92)

Accepted Answer

A)  alpha
B)  beta (electron) 
C)  beta (positron) 
D)  gamma quantumE) B) and C)
F) C) and D)

Question 16

The alpha radiation first classified by Rutherford was in fact which of the following?

Accepted Answer

A)  helium nuclei
B)  high energy quanta
C)  electrons
D)  positronsE) B) and D)
F) All of the above

Question 17

A radioactive isotope that emits a gamma quantum will change in what respect?

Accepted Answer

A)  Atomic number increases by one.
B)  Atomic number decreases by one.
C)  Atomic mass number decreases by one.
D)  None of the above choices are valid.E) A) and C)
F) C) and D)

Question 18

The fact that the binding energy per nucleon does not depend very strongly on the volume of the nucleus indicates that

Accepted Answer

A)  the strong nuclear force saturates.
B)  nucleons don't move throughout the nucleus.
C)  all nuclei have the same volume.
D)  the radius of a nucleus is directly proportional to the number of nucleons.E) None of the above
F) C) and D)

Question 19

The original nucleus and the final nucleus will be different isotopes of the same element for which decay scheme of the original nucleus?

Accepted Answer

A)  alpha decay followed by two beta (electron) decays
B)  two gamma decays
C)  a beta (electron) decay followed by an alpha decay
D)  a beta (electron) decay followed by neutron emissionE) B) and C)
F) A) and D)

Question 20

The molecular mass for chlorine is not an integer multiple of the molecular mass of hydrogen but is about 35.5 times the molecular mass of hydrogen.This is primarily because

Accepted Answer

A)  the proton and neutron have different masses.
B)  there are different isotopes of chlorine.
C)  of the binding energy of the chlorine nucleus.
D)  the chlorine nucleus has 35.5 nucleons.E) C) and D)
F) A) and D) B

Exam 29: Nuclear Physics

The ratio of the numbers of neutrons to protons in the nucleus of naturally occurring isotopes tends to vary with atomic number in what manner?

Correct Answer
verified

The isotope ¹⁴C cannot be used in dating old samples of which of the following?

Correct Answer
verified

An alpha particle (mass = 6.68 × 10−²⁷ kg) is emitted from a radioactive nucleus with a kinetic energy of 4.55 MeV.How fast is the alpha particle moving in m/s? (1 MeV = 1.6 × 10−¹³ J)

Correct Answer
verified

Two nuclei collide,one originally at rest,in an endothermic nuclear reaction with Q = −2.05 MeV.Which of the following describes the minimum kinetic energy needed in the reactant nuclei for the reaction is to occur?

Correct Answer
verified
B

Tritium has a half-life of 12.3 years.How many years will elapse when the radioactivity of a tritium sample diminishes to 35% of its original value?

Correct Answer
verified

There are samples of two different isotopes,X and Y.Both contain the same number of radioactive atoms.Sample X has a half-life twice that of Y.How do their decay rates compare?

Correct Answer
verified

If the sum total mass of reactants in a nuclear reaction is greater than that of product particles,then which of the following statements best describes the conditions of the reaction?

Correct Answer
verified

Tritium has a half-life of 12.3 years.What proportion of its original radioactivity will a sample have after 2 years?

Correct Answer
verified

Chromium-55 (54.940 8 u) emits an electron leaving a daughter nucleus of manganese-55 (54.938 0 u) .How much energy is released in this reaction? (1 u = 931.5 MeV/c²)

Correct Answer
verified

Neglecting recoil of the gold nucleus,how much kinetic energy must an alpha particle (charge = 2 × 1.6 × 10^-19 C) have to approach to within 5.70 × 10−¹⁴ m of a gold nucleus (charge = 79 × 1.6 × 10−¹⁹ C) ? (k_e = 8.99 × 10⁹ N⋅m²/C² and 1 MeV = 1.6 × 10−¹³ J)

Correct Answer
verified

An ancient building was known to have been built 3 000 years ago.Approximately what proportion of Carbon-14 atoms are yet in the building's wooden framing compared to the number which were present at the time of its construction? (half life of ¹⁴C = 5 730 years)

Correct Answer
verified

When radium-224 emits an alpha particle,the remaining daughter nucleus is which of the following?

Correct Answer
verified

Correct Answer
verified

1 Bq = ________ Ci?

Correct Answer
verified
C

What particle is emitted when ²⁴⁰Pu decays to ²³⁶U? (atomic numbers of Pu and U are,respectively,94 and 92)

Correct Answer
verified

The alpha radiation first classified by Rutherford was in fact which of the following?

Correct Answer
verified

A radioactive isotope that emits a gamma quantum will change in what respect?

Correct Answer
verified

The fact that the binding energy per nucleon does not depend very strongly on the volume of the nucleus indicates that

Correct Answer
verified

The original nucleus and the final nucleus will be different isotopes of the same element for which decay scheme of the original nucleus?

Correct Answer
verified

The molecular mass for chlorine is not an integer multiple of the molecular mass of hydrogen but is about 35.5 times the molecular mass of hydrogen.This is primarily because

Correct Answer
verified
B

Exam 29: Nuclear Physics

The ratio of the numbers of neutrons to protons in the nucleus of naturally occurring isotopes tends to vary with atomic number in what manner?

Correct AnswerverifiedShow Answer

The isotope 14C cannot be used in dating old samples of which of the following?

Correct AnswerverifiedShow Answer

An alpha particle (mass = 6.68 × 10−27 kg) is emitted from a radioactive nucleus with a kinetic energy of 4.55 MeV.How fast is the alpha particle moving in m/s? (1 MeV = 1.6 × 10−13 J)

Correct AnswerverifiedShow Answer

Two nuclei collide,one originally at rest,in an endothermic nuclear reaction with Q = −2.05 MeV.Which of the following describes the minimum kinetic energy needed in the reactant nuclei for the reaction is to occur?

Correct AnswerverifiedB

Tritium has a half-life of 12.3 years.How many years will elapse when the radioactivity of a tritium sample diminishes to 35% of its original value?

Correct AnswerverifiedShow Answer

There are samples of two different isotopes,X and Y.Both contain the same number of radioactive atoms.Sample X has a half-life twice that of Y.How do their decay rates compare?

Correct AnswerverifiedShow Answer

If the sum total mass of reactants in a nuclear reaction is greater than that of product particles,then which of the following statements best describes the conditions of the reaction?

Correct AnswerverifiedShow Answer

Tritium has a half-life of 12.3 years.What proportion of its original radioactivity will a sample have after 2 years?

Correct AnswerverifiedShow Answer

Chromium-55 (54.940 8 u) emits an electron leaving a daughter nucleus of manganese-55 (54.938 0 u) .How much energy is released in this reaction? (1 u = 931.5 MeV/c2)

Correct AnswerverifiedShow Answer

Neglecting recoil of the gold nucleus,how much kinetic energy must an alpha particle (charge = 2 × 1.6 × 10-19 C) have to approach to within 5.70 × 10−14 m of a gold nucleus (charge = 79 × 1.6 × 10−19 C) ? (ke = 8.99 × 109 N⋅m2/C2 and 1 MeV = 1.6 × 10−13 J)

Correct AnswerverifiedShow Answer

An ancient building was known to have been built 3 000 years ago.Approximately what proportion of Carbon-14 atoms are yet in the building's wooden framing compared to the number which were present at the time of its construction? (half life of 14C = 5 730 years)

Correct AnswerverifiedShow Answer

When radium-224 emits an alpha particle,the remaining daughter nucleus is which of the following?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

1 Bq = ________ Ci?

Correct AnswerverifiedC

What particle is emitted when 240Pu decays to 236U? (atomic numbers of Pu and U are,respectively,94 and 92)

Correct AnswerverifiedShow Answer

The alpha radiation first classified by Rutherford was in fact which of the following?

Correct AnswerverifiedShow Answer

A radioactive isotope that emits a gamma quantum will change in what respect?

Correct AnswerverifiedShow Answer

The fact that the binding energy per nucleon does not depend very strongly on the volume of the nucleus indicates that

Correct AnswerverifiedShow Answer

The original nucleus and the final nucleus will be different isotopes of the same element for which decay scheme of the original nucleus?

Correct AnswerverifiedShow Answer

The molecular mass for chlorine is not an integer multiple of the molecular mass of hydrogen but is about 35.5 times the molecular mass of hydrogen.This is primarily because

Correct AnswerverifiedB

Correct Answer
verified

The isotope ¹⁴C cannot be used in dating old samples of which of the following?

Correct Answer
verified

An alpha particle (mass = 6.68 × 10−²⁷ kg) is emitted from a radioactive nucleus with a kinetic energy of 4.55 MeV.How fast is the alpha particle moving in m/s? (1 MeV = 1.6 × 10−¹³ J)

Correct Answer
verified

Correct Answer
verified
B

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Chromium-55 (54.940 8 u) emits an electron leaving a daughter nucleus of manganese-55 (54.938 0 u) .How much energy is released in this reaction? (1 u = 931.5 MeV/c²)

Correct Answer
verified

Neglecting recoil of the gold nucleus,how much kinetic energy must an alpha particle (charge = 2 × 1.6 × 10^-19 C) have to approach to within 5.70 × 10−¹⁴ m of a gold nucleus (charge = 79 × 1.6 × 10−¹⁹ C) ? (k_e = 8.99 × 10⁹ N⋅m²/C² and 1 MeV = 1.6 × 10−¹³ J)

Correct Answer
verified

An ancient building was known to have been built 3 000 years ago.Approximately what proportion of Carbon-14 atoms are yet in the building's wooden framing compared to the number which were present at the time of its construction? (half life of ¹⁴C = 5 730 years)

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
C

What particle is emitted when ²⁴⁰Pu decays to ²³⁶U? (atomic numbers of Pu and U are,respectively,94 and 92)

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
B