Radioactivity and Half-Life CFU

What type of radioactive decay involves the release of an alpha particle from the nucleus?

• Beta decay

• Gamma decay

• Alpha decay

• Positron emission

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DOK Level 1: Recall

Which of the following is NOT a type of radioactive decay?

• Alpha decay

• Beta decay

• Gamma decay

• Sigma decay

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DOK Level 1: Recall

If the half-life of a radioactive isotope is 10 years, how much of a 100 gram sample remains undecayed after 20 years?

• 25 grams

• 50 grams

• 75 grams

• 100 grams

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DOK Level 2: Skill/Concept

• Beta particle

• Gamma ray

• Alpha particle

• Neutron

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DOK Level 2: Skill/Concept

Calculate the remaining quantity of a 200 gram sample of a radioactive isotope after three half-lives, if the half-life of the isotope is 5 years.

• 100 grams

• 50 grams

• 25 grams

• 12.5 grams

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DOK Level 2: Skill/Concept

In beta decay, a neutron in the nucleus of an atom changes into a proton and emits an electron. What is this electron called?

• Beta particle

• Alpha particle

• Gamma ray

• Positron

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DOK Level 1: Recall

• Alpha decay

• Beta decay

• Gamma decay

• Positron emission

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DOK Level 2: Skill/Concept

If a radioactive substance has a half-life of 4 years and initially there was 160 grams of it, how much will remain after 8 years?

• 80 grams

• 40 grams

• 20 grams

• 10 grams

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DOK Level 3: Strategic Thinking

Uranium-238  decays into  Thorium-234  by emitting .........

• an alpha particle
• a beta particle
• gamma rays
• visible light

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NGSS.HS-PS1-8

In the equation, ¹⁴₆C --> ¹⁴₇N + ⁰_-1B, the _______ decay of radioactive carbon-14 results in the creation of a new nitrogen-14 atom.

• Gamma

• Beta

• Alpha

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NGSS.HS-PS1-8