Unit 12 Review 1

What is the definition of half-life in nuclear physics?

• The time it takes for all atoms in a sample to decay

• The time it takes for half of the radioactive atoms in a sample to decay

• The time it takes for a sample to double in mass

• The time it takes for a nucleus to split into two

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Which process involves splitting a heavy nucleus into two lighter nuclei?

• Fusion

• Fission

• Radioactive decay

• Ionization

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Which element was primarily responsible for the health issues experienced by the Radium Girls?

• Uranium

• Plutonium

• Radium

• Radon

What is the main fuel used in nuclear fusion reactions in the sun?

• Uranium-235

• Plutonium-239

• Hydrogen isotopes

• Carbon-14

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Which of the following is a correct balanced nuclear equation for the alpha decay of Uranium-238?

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If a radioactive isotope has a half-life of 10 years, how much of a 100 g sample will remain after 20 years?

• 100 g

• 75 g

• 50 g

• 25 g

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Which of the following best describes nuclear fusion?

• The splitting of a nucleus into smaller parts

• The combining of two light nuclei to form a heavier nucleus

• The emission of electrons from a nucleus

• The absorption of neutrons by a nucleus

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The Radium Girls were primarily employed to:

• Build atomic bombs

• Paint watch dials with luminous paint

• Mine uranium

• Operate nuclear reactors

Which of the following is a product of nuclear fission of Uranium-235?

• Helium-4

• Krypton-92

• Carbon-14

• Hydrogen-2

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If a sample of a radioactive isotope decays from 80 g to 10 g in 3 half-lives, what is the half-life if the total time elapsed is 15 years?

• 3 years

• 5 years

• 7.5 years

• 15 years

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