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What features do the r- and s-processes for element formation have in common? How do they differ?

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Both involve neutron absorption by a nuc...

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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

F) A) and B)
G) C) and E)

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A 30.0-kg child receives 2.65 × 107 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 the above

F) A) and B)
G) A) and C)

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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

F) A) and B)
G) A) and C)

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Most foodstuffs contain natural, radioactive isotopes.

A) True
B) False

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Bombardment of uranium-238 nuclei by carbon-12 nuclei produces californium-246 and neutrons. Write a complete, balanced equation for this nuclear process.

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


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

F) A) and B)
G) A) and C)

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Fill in missing sub- and superscripts for all particles to complete the following equation for alpha decay. Fill in missing sub- and superscripts for all particles to complete the following equation for alpha decay.

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Identify the missing species in the following nuclear transmutation. Identify the missing species in the following nuclear transmutation. A) B) C) D) E) none of the above


A) Identify the missing species in the following nuclear transmutation. A) B) C) D) E) none of the above
B) Identify the missing species in the following nuclear transmutation. A) B) C) D) E) none of the above
C) Identify the missing species in the following nuclear transmutation. A) B) C) D) E) none of the above
D) Identify the missing species in the following nuclear transmutation. A) B) C) D) E) none of the above
E) none of the above

F) A) and E)
G) A) and B)

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Palladium-107 undergoes decay (t1/2 = 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 × 107 y
B) 1.4 × 107 y
C) 1.2 × 106 y
D) 8.3 × 105 y
E) 1.2 × 105 y

F) A) and B)
G) C) and D)

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Which one of the following equations correctly represents alpha decay of Which one of the following equations correctly represents alpha decay of ? A) B) C) D) E) ?


A) Which one of the following equations correctly represents alpha decay of ? A) B) C) D) E)
B) Which one of the following equations correctly represents alpha decay of ? A) B) C) D) E)
C) Which one of the following equations correctly represents alpha decay of ? A) B) C) D) E)
D) Which one of the following equations correctly represents alpha decay of ? A) B) C) D) E)
E) Which one of the following equations correctly represents alpha decay of ? A) B) C) D) E)

F) None of the above
G) C) and E)

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


A) 1250
B) 78
C) 39
D) 0
E) none of the above

F) A) and D)
G) D) and E)

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A pure sample of tritium, 3H, was prepared and sealed in a container for a number of years. Tritium undergoes 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

F) B) and C)
G) B) and E)

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Identify the missing species in the following nuclear transmutation. Identify the missing species in the following nuclear transmutation. A) 2 B) 3 C) D) E)


A) 2 Identify the missing species in the following nuclear transmutation. A) 2 B) 3 C) D) E)
B) 3 Identify the missing species in the following nuclear transmutation. A) 2 B) 3 C) D) E)
C) Identify the missing species in the following nuclear transmutation. A) 2 B) 3 C) D) E)
D) Identify the missing species in the following nuclear transmutation. A) 2 B) 3 C) D) E)
E) Identify the missing species in the following nuclear transmutation. A) 2 B) 3 C) D) E)

F) C) and D)
G) A) and E)

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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.

F) All of the above
G) A) and B)

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


A) Which of the following isotopes is most likely to be unstable? A) B) C) D) E)
B) Which of the following isotopes is most likely to be unstable? A) B) C) D) E)
C) Which of the following isotopes is most likely to be unstable? A) B) C) D) E)
D) Which of the following isotopes is most likely to be unstable? A) B) C) D) E)
E) Which of the following isotopes is most likely to be unstable? A) B) C) D) E)

F) B) and E)
G) A) and E)

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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.

F) A) and D)
G) B) and D)

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Select the nuclide that completes the following nuclear reaction. Select the nuclide that completes the following nuclear reaction. A) B) C) D) E)


A) Select the nuclide that completes the following nuclear reaction. A) B) C) D) E)
B) Select the nuclide that completes the following nuclear reaction. A) B) C) D) E)
C) Select the nuclide that completes the following nuclear reaction. A) B) C) D) E)
D) Select the nuclide that completes the following nuclear reaction. A) B) C) D) E)
E) Select the nuclide that completes the following nuclear reaction. A) B) C) D) E)

F) C) and D)
G) A) and D)

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Who discovered radioactivity?


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

F) All of the above
G) C) and E)

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Identify the missing species in the following nuclear transmutation. Identify the missing species in the following nuclear transmutation. A) B) C) D) E)


A) Identify the missing species in the following nuclear transmutation. A) B) C) D) E)
B) Identify the missing species in the following nuclear transmutation. A) B) C) D) E)
C) Identify the missing species in the following nuclear transmutation. A) B) C) D) E)
D) Identify the missing species in the following nuclear transmutation. A) B) C) D) E)
E) Identify the missing species in the following nuclear transmutation. A) B) C) D) E)

F) A) and B)
G) None of the above

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Showing 41 - 60 of 94

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