Radioactivity Review

What is Half-life?

• The amount of time it takes for some of the nuclei in a sample of the isotope to decay
• The amount of time it takes for half the electrons in a sample of the isotope to decay
• The amount of time it takes for half the nuclei in a sample of the isotope to decay
• the amount of time it takes to double the nuclei in a sample of the isotope to decay

Tags

NGSS.HS-PS1-8

The half-life of strontium-90 is 25 years. How much strontium-90 will remain after 100 years if the initial amount is 4.0 g?

• 3.0g
• 0.25mg
• 0.3g
• 0.25g

Tags

NGSS.HS-PS1-8

Two or more nuclei combine to form one larger nucleus in the process of nuclear _____.

• Fusion
• Fission
• Tracing
• Decay

Tags

NGSS.HS-PS1-8

NGSS.HS-ESS1-1

Two or more nuclei combine to form one larger nucleus in the process of nuclear _____.

• Fusion
• Fission
• Tracing
• Decay

Tags

NGSS.HS-PS1-8

This is an example of a...

• Fission reaction

• Fusion reaction

• Decomposition reaction

• Decay

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NGSS.HS-PS1-8

This is an example of ---

• Radioactive Decay
• Nuclear Fission
• Nuclear Fusion
• Fossil fuel reaction

Tags

NGSS.HS-PS1-8

NGSS.HS-ESS1-1

After one half life, a sample will begin to have more of the parent isotope than the daughter isotope.

• TRUE

• FALSE

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NGSS.HS-PS1-8

What makes something radioactive?

• elements with an atomic number above 81
• an unstable nucleus
• contaminated sewage
• It decays over time

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NGSS.HS-PS1-8

What is an isotope?

• forms of the same element that contain equal numbers of electrons but different numbers of protons

• forms of the same element

• forms of the same element that contain equal numbers of protons but different numbers of neutrons

• An atom with no nucleus

What is the half-life of iodine-131?

• 32 days
• 8 days
• 16 days
• 24 days

Tags

NGSS.HS-PS1-8