Deck 24: Nuclear Reactions and Their Applications

Question 1

No alpha decay is observed for isotopes of elements with Z < 83.

Answer 1

False

Question 2

Which one of the following descriptions relating to nuclear reactions is correct?

A)The ratio of neutrons to protons remains constant.
B)The number of protons plus neutrons remains constant.
C)The number of electron remains constant.
D)The total charge changes.
E)The total number of nucleons changes.

Answer 2

The number of protons plus neutrons remains constant.

Question 3

Radioactive decay follows zero-order kinetics.

Answer 3

False

Question 4

Select the nuclide that completes the following nuclear reaction.

A)
B)
C)
D)
E)

Question 5

After 4 half-lives, the fraction of a radioactive isotope which still remains is approximately one-eighth.

Question 6

The (negative) binding energy per nucleon reaches a maximum for the isotope

Question 7

Which one of the following equations correctly represents electron capture by the nucleus?

A)
B)
C)
D)
E)

Question 8

Most foodstuffs contain natural, radioactive isotopes.

Question 9

Which one of the following is an incorrect representation of the indicated particle or nucleus?

A)Positron:
B)Neutron:
C)Helium-3:
D)Alpha particle:
E)Proton:

Question 10

Which of the following types of radioactive decay does not produce new element?

A)Gamma emission
B)Electron capture
C)Beta emission
D)Alpha emission
E)Double beta emission

Question 11

Which one of the following is a subatomic particle closely related to the positron?

A)Proton
B)Electron
C)Negatron
D)Neutron
E)Neutrino

Question 12

Who discovered radioactivity?

A)Geiger
B)Curie
C)Roentgen
D)Becquerel
E)Rutherford

Question 13

Which one of the following equations correctly represents alpha decay of ?

A)
B)
C)
D)
E)

Question 14

The s-process involves a slow succession of neutron absorption and beta decay processes during the normal life of a star.

Question 15

Positron decay and electron capture have the same net effect on the Z and N values of a nucleus.

Question 16

Gamma rays are not deflected by an electric field.

Question 17

Gamma rays are high energy electrons.

Question 18

Which one of the following equations correctly represents positron decay of ?

A)
B)
C)
D)
E)

Question 19

In the equation above, what particle or type of radiation needs to be included on the right-hand side in order to balance it?

A)Alpha
B)Beta
C)Gamma
D)Positron
E)Proton

Question 20

The r-process occurs during supernova explosions.

Question 21

Select the nuclide that completes the following nuclear reaction.

A)
B)
C)
D)
E)

Question 22

The isotope is unstable. This is predictable because

A)N/ Z ≠ 1.
B)N/ Z is relatively low and Z < 20.
C)N/ Z is relatively large and Z < 20.
D)Z is small.
E)N is large.

Question 23

The isotope is unstable. This is predictable because

A)the number of neutrons is too large in relation to the number of protons.
B)the number of neutrons is too small in relation to the number of protons.
C)the atomic number is too large.
D)the mass number is too large.
E)Sc isotopes are all unstable.

Question 24

Select the nuclide that completes the following nuclear reaction.

A)
B)
C)
D)
E)None of these choices are correct.

Question 25

Select the nuclide that completes the following nuclear reaction.

A)
B)
C)
D)
E)

Question 26

Select the nuclide that completes the following nuclear reaction.

A)
B)
C)
D)
E)None of these choices are correct.

Question 27

Select the nuclide that completes the following nuclear reaction.

A)
B)
C)
D)
E)

Question 28

Select the nuclide that completes the following nuclear reaction.

A)
B)
C)
D)
E)

Question 29

Which of the following isotopes is most likely to be unstable?

A)
B)
C)
D)
E)

Question 30

Select the nuclide that completes the following nuclear reaction.

A)
B)
C)
D)
E)

Question 31

An isotope with a low value of N/Z will generally decay through

A)α decay.
B)β decay.
C)γ decay.
D)electron capture.
E)spontaneous fission.

Question 32

The radioisotope will decay through

A)α decay.
B)β decay.
C)γ decay.
D)positron decay.
E)electron capture.

Question 33

The radioisotope will decay through

A)α decay.
B)β decay.
C)positron decay.
D)electron capture.
E)γ decay.

Question 34

Which of the following isotopes is most likely to be unstable?

A)
B)
C)
D)
E)

Question 35

The isotopes are all stable, while is radioactive. The mode of decay for is most likely to be

A)positron decay.
B)α decay.
C)γ decay.
D)electron capture.
E)β decay.

Question 36

The isotopes are all stable, while is radioactive. The mode of decay for is most likely to be

A)positron decay.
B)alpha decay.
C)beta decay.
D)gamma decay.
E)fission.

Question 37

An isotope with a high value of N/Z will tend to decay through

A)α decay.
B)β decay.
C)positron decay.
D)electron capture.
E)γ decay.

Question 38

The radioisotope will decay through

A)α decay.
B)β decay.
C)γ decay.
D)electron capture.
E)spontaneous fission.

Question 39

Which of the following isotopes is most likely to be unstable?

A)
B)
C)
D)
E)

Question 40

An isotope with Z > 83, which lies close to the band of stability, will generally decay through

A)α decay.
B)β decay.
C)γ decay.
D)positron decay.
E)electron capture.

Question 41

What is the specific activity (in Ci/g) of an isotope if 3.56 mg emits 4.26 × 10⁸ β particles per second?

A)0.003232 Ci/g
B)0.0115 Ci/g
C)0.309 Ci/g
D)3.23 Ci/g
E)None of these choices are correct.

Question 42

Detection of radiation by a Geiger-Müller counter depends on

A)the emission of a photon from an excited atom.
B)the ability of an ionized gas to carry an electrical current.
C)the emission of a photon of light by the radioactive particle.
D)the ability of a photomultiplier tube to amplify the electrical signal from a phosphor.
E)the detection of the sound made by decay particles.

Question 43

Which one of the following nuclei has a magic number of neutrons and/or protons?

A)
B)
C)
D)
E)

Question 44

A pure sample of tritium, ³H, was prepared and sealed in a container for a number of years. Tritium undergoes β decay with a half-life of 12.32 years. How long has the container been sealed if analysis of the contents shows there are 5.25 mol of ³H and 6.35 mol of ³He present?

A)2.34 y
B)3.38 y
C)9.77 y
D)14.1 y
E)25.6 y

Question 45

Iodine-131, t_1/2 = 8.0 days, is used in diagnosis and treatment of thyroid gland diseases. If a laboratory sample of iodine-131 initially emits 9.95 × 10¹⁸ β particles per day, how long will it take for the activity to drop to 6.22 × 10¹⁷ β particles per day?

A)2.0 days
B)16 days
C)32 days
D)128 days
E)None of these choices are correct.

Question 46

The isotope has a half-life of 7.5 seconds. If a sample contains 144 atoms of approximately how many such atoms were there present 30 seconds earlier?

A)576
B)1152
C)2304
D)4320
E)4.30 × 10 ⁸

Question 47

The nuclide Pb-210 undergoes three successive decays (beta, alpha, and beta, respectively) to form a stable nuclide. What are the three nuclides that form from Pb-210 in this decay series?

A)Tl-210, Au-206, Pt-206
B)Bi-210, Tl-206, Pb-206
C)Pb-209, Hg-205, Hg-204
D)Bi-210, Pb-206, Bi-206
E)None of these choices are correct.

Question 48

So-called "magic numbers" of particles are thought to convey extra stability to certain nuclei. These magic numbers refer to which of the following particles?

A)Protons only
B)Electrons only
C)Positrons only
D)Neutrons only
E)Protons and Neutrons

Question 49

All the disintegrations of a sample of an unknown nuclide weighing 4.6 × 10^-2 g were counted. In the first half-life of the sample, the total number of disintegrations counted was 4.3 × 10²⁰. What is the atomic weight of the unknown element?

A)32 amu
B)16 amu
C)8 amu
D)4 amu
E)None of these choices are correct.

Question 50

Which of the following isotopes is definitely unstable?

A)
B)
C)
D)
E)

Question 51

A 7.85 × 10^-5 mol sample of copper-61 emits 1.47 × 10¹⁹ positrons in 90.0 minutes. What is the decay constant for copper-61?

A)0.00230 h ^-1
B)0.00346 h ^-1
C)0.207 h ^-1
D)0.311 h ^-1
E)None of these choices are correct.

Question 52

The isotopes of promethium, and are unstable, and lie on opposite sides of the "line of stability". Which of the following combinations is most likely to represent the type of decay for these isotopes?

A)Promethium-144, β decay; Promethium-134, positron decay
B)Promethium-144, positron decay; Promethium-134, β decay
C)Promethium-144, positron decay; Promethium-134, electron capture
D)Promethium-144, electron capture; Promethium-134, positron decay
E)Promethium-144, β decay; Promethium-134, γ decay

Question 53

Which of the following series of radioactive decays would convert Pa-234 to Ra-226?

A)Beta, Alpha, Beta
B)Alpha, Alpha
C)Beta, Alpha, Alpha, Beta
D)Beta, Alpha, Alpha
E)Alpha, Beta, Gamma

Question 54

A certain isotope has a specific activity of 7.29 × 10^-4 Ci/g. How many α particles will a 75.0 mg sample emit in one hour?

A)9.99 × 10 ⁴
B)2.02 × 10 ⁶
C)7.28 × 10 ⁹
D)1.29 × 10 ¹²
E)None of these choices are correct.

Question 55

The radiochemist, Will I. Glow, studied thorium-232 and found that 2.82 × 10^-7 moles emitted 8.42 × 10⁶ α particles in one year. What is the decay constant for thorium-232?

A)3.35 × 10 ^-14 yr ^-1
B)4.96 × 10 ^-11 yr ^-1
C)1.40 × 10 ¹⁰ yr ^-1
D)2.99 × 10 ¹³ yr ^-1
E)None of these choices are correct.

Question 56

The isotope has a half-life of 21 hours. If a sample initially contains exactly 10000 atoms of , approximately how many of these atoms will remain after one week?

A)1250
B)78
C)39
D)0
E)None of these choices are correct.

Question 57

Cesium-134 is a β emitter with a half-life of 2.0 years. How much of a 2.50-g sample of cesium-134 will remain after 10 years?

A)0.0024 g
B)0.078 g
C)0.25 g
D)0.50 g
E)None of these choices are correct.

Question 58

A scintillation counter

A)measures the signal coming from an ionized gas.
B)measures light emissions from excited atoms.
C)depends on an avalanche of electrons generated as a particle moves through a tube of argon gas.
D)detects high energy radiation better than low energy radiation.
E)detects an electric current in a gas.

Question 59

Palladium-107 undergoes β decay (t_1/2 = 6.5 × 10⁵ yr) to form silver-107. How long will it take for 0.150 mol of silver-107 to form from 1.25 mol of palladium-107?

A)2.0 × 10 ⁷ y
B)1.4 × 10 ⁷ y
C)1.2 × 10 ⁶ y
D)8.3 × 10 ⁵ y
E)1.2 × 10 ⁵ y

Question 60

A 9.52 × 10^-5 mol sample of rubidium-86 emits 8.87 × 10¹⁶ β particles in one hour. What is the half-life of rubidium-86?

A)2.23 × 10 ^-3 h
B)1.55 × 10 ^-3 h
C)448 h
D)645 h
E)None of these choices are correct.

Question 61

An alkaline earth element is radioactive. It and its daughter elements decay by emitting a total of three alpha particles in succession. In what group of the periodic table is the element resulting from the emission of the third alpha particle?

A)4A (14)
B)5A (15)
C)6A (16)
D)7A (17)
E)8A (18)

Question 62

Identify the missing species in the following nuclear transmutation.

A)
B)
C)
D)
E)

Question 63

Exposure to 10 nCi for 10 minutes is more hazardous for a child than for an adult because

A)the child's cells are dividing more rapidly than the adult's and are, therefore, more susceptible to the radiation.
B)the child's smaller body size makes the effective dose larger for the child than for the adult.
C)the child's immune system is not developed well enough to resist damage.
D)the child's skin is not as thick as an adult's and cannot block as much radiation.
E)None of these choices are correct.

Question 64

Which one of the following elements is formed largely in supernova explosions?

A)H
B)He
C)Mg
D)Fe
E)U

Question 65

Carbon-14 will emit a β particle with an energy of 0.1565 MeV. What is this energy in joules?

A)1.0 × 10 ^-24 J
B)2.5 × 10 ^-20 J
C)1.0 × 10 ^-18 J
D)2.5 × 10 ^-14 J
E)None of these choices are correct.

Question 66

A patient's thyroid gland is to be exposed to an average of 5.5 µCi for 16 days as an ingested sample of iodine-131 decays. If the energy of the β radiation is 9.7 × 10^-14 J and the mass of the thyroid is 32.0 g, what is the dose received by the patient?

A)0.027 rads
B)1.2 rads
C)37 rads
D)85 rads
E)None of these choices are correct.

Question 67

Identify the missing species in the following nuclear transmutation.

A)
B)
C)
D)
E)

Question 68

An 85-kg person exposed to barium-141 receives 2.5 × 10⁵ β particles, each with an energy of 5.2 × 10^-13 J. How many rads does the person receive?

A)2.4 × 10 ^-20
B)1.5 × 10 ^-7
C)1.8 × 10 ^-16
D)6.1 × 10 ^-15
E)None of these choices are correct.

Question 69

It is believed that two carbon-12 nuclei can react in the core of a supergiant star to form sodium-23 and hydrogen-1. Calculate the energy released from this reaction for each mole of hydrogen formed. The masses of carbon-12, sodium-23, and hydrogen-1 are 12.0000 amu, 22.989767 amu, and 1.007825, respectively.

A)2.16 × 10 ¹⁴ kJ
B)2.16 × 10 ¹¹ kJ
C)2.16 × 10 ⁸ kJ
D)2.16 × 10 ⁵ kJ
E)None of these choices are correct.

Question 70

The difference between the rad and the rem is

A)the rem is a rad per year.
B)the rad takes into account the type of radiation.
C)the rem takes into account the effect on the particular biological tissue.
D)the rem is a rad per kilogram.
E)None of these choices are correct.

Question 71

A 55-kg person exposed to thorium-234 receives 7.5 × 10⁴ β particles, each with an energy of 1.6 × 10^-14 J. How many rads does the person receive?

A)2.1 × 10 ^-19
B)1.2 × 10 ^-17
C)2.2 × 10 ^-9
D)1.2 × 10 ^-9
E)None of these choices are correct.

Question 72

Which of the following materials is put into a nuclear reactor to slow the chain reaction?

A)Heavy water
B)Moderators
C)Control rods
D)Reflectors
E)Chlorine

Question 73

Identify the missing species in the following nuclear transmutation.

A)
B)
C)
D)
E)

Question 74

Calcium-39 undergoes positron decay. Each positron carries 5.49 MeV of energy. How much energy will be emitted when 0.0025 mol of calcium-39 decays?

A)13.2 kJ
B)1.32 × 10 ⁴ kJ
C)1.32 × 10 ⁶ kJ
D)1.32 × 10 ⁹ kJ
E)None of these choices are correct.

Question 75

Sodium-21 will emit positrons each having an energy of 4.0 × 10^-13 J. What is this energy in MeV?

A)4.0 × 10 ^-7 MeV
B)2.5 MeV
C)40 MeV
D)2.5 × 10 ⁶ MeV
E)None of these choices are correct.

Question 76

Assuming that no other particles are produced, which of the following particles could be used to bombard nitrogen-14 in order to make fluorine-18?

A)Alpha particle
B)Beta particle
C)Neutron
D)Proton
E)Positron

Question 77

In living organisms, C-14 atoms disintegrate at a rate of 15.3 atoms per minute per gram of carbon. A charcoal sample from an archaeological site has a C-14 disintegration rate of 9.16 atoms per minute per gram of carbon. Estimate the age of this sample. The half-life of C-14 is 5730 years.

A)3170 years
B)3430 years
C)4020 years
D)4790 years
E)6750 years

Question 78

Identify the missing species in the following nuclear transmutation.

A)
B)
C)
D)
E)None of these choices are correct.

Question 79

A N-14 nucleus is hit by a particle, forming a C-14 nucleus and a proton as the only products. Identify the type of particle which struck the N-14 nucleus.

A)Alpha
B)Proton
C)Electron
D)Neutron
E)Deuterium

Question 80

A 30.0-kg child receives 2.65 × 10⁷ β particles, each with an energy of 4.60 × 10^-13 J. If the RBE = 0.78, how many millirem did the child receive?

A)3.2 × 10 ^-7
B)5.2 × 10 ^-7
C)5.2 × 10 ^-4
D)3.2 × 10 ^-2
E)None of these choices are correct.