AMS II Half Life/Chemical & Physical weathering Recap 2025

What is the maximum age of organic materials that carbon-14 dating can accurately determine?

• 10,000 years

• 25,000 years

• 60,000 years

• 100,000 years

What is the half-life of carbon-14?

• About 1,000 years

• About 5,730 years

• About 10,000 years

• About 2,500 years

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NGSS.HS-PS1-8

The % of the parent isotope remaining after 1 Half Life.

• 50%

• 25%

• 12.5%

• 6.25%

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NGSS.HS-PS1-8

The % of the parent isotope remaining after 2 Half Lives.

• 50%

• 25%

• 12.5%

• 6.25%

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NGSS.HS-PS1-8

Imagine you have 50,000 atoms of uranium-238. If U-238 has a half-life of 4.5 billion years, how many U-238 atoms will be left after 4.5 billion years? 

• 25,000
• 50,000
• 12,500
• 0

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NGSS.HS-PS1-8

The length of time required for half of the radioactive atoms in a sample to decay is its...

• era
• age
• half-life
• eon

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NGSS.HS-PS1-8

You have 100 grams of radioactive C-14. The half life of C-14 is 5730 years. 
How many grams are left after 1 half life? 

• 100 grams
• 25 grams
• 2 grams
• 50 grams

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NGSS.HS-PS1-8

What is the half-life of the radioactive isotope potassium-40?

• 1.3 billion years

• 2.3 billion years

• 3.3 billion years

• 4.3 billion years

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NGSS.HS-PS1-8

Which radioisotope is used to determine the age of once-living organisms?

• carbon-14

• cobalt-60

• iodine-131

• uranium-238

The half-life of Uranium-238 as shown on this graph is closest to

• 2.5 billion years

• 3.5 billion years

• 4.5 billion years

• 5.5 billion years

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NGSS.HS-PS1-8