absolute dating

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

• era
• age
• half-life
• eon

Tags

NGSS.HS-PS1-8

The original element that undergoes radioactive decay is known as the...

• daughter element
• half-life
• parent element
• carbon-14

Tags

NGSS.HS-PS1-8

Radiometric dating is possible because the rates of decay of radioactive isotopes _____.

• change over time
• change from place to place
• are constant
• vary widely

Tags

NGSS.HS-PS1-8

What percent of carbon-14 would be left after 11,460 years? (2 half lives)

• 100%
• 75%
• 50%
• 25%

Tags

CCSS.HSF.LE.A.4

If the half-life of a radioactive group of atoms is 100 years, then how old is the rock if the parent decays to 25%?

• 25 years
• 200 years
• 400 years
• 800 years

Tags

CCSS.HSF.LE.A.4

The Earth is estimated to be how old?

• 4.6 Million years old
• 6,000 years old
• 4.6 Billion years old
• Who knows

Tags

NGSS.HS-ESS1-6

How does absolute age differ from relative age?

• only absolute dating indicates which rock is older than another
• only absolute dating finds the age in years
• only relative dating finds the age in years

Scientists use radioactive decay to measure...

• relative time

• absolute time

• cross-cutting time

• time of day

Tags

NGSS.HS-PS1-8

The time it takes for 50% of the nuclei in a radioactive sample to decay to its stable isotope is called _____.

• the daughter product
• geologic time
• the half-life
• the half-time

Tags

NGSS.HS-PS1-8

The half-life of potassium-40 is 1.25 billion years. If you begin with 12 grams of potassium-40, how much is left after two half-lives?

• 12 grams

• 6 grams

• 3 grams

• 1.5 grams

Tags

NGSS.HS-PS1-8