Absolute Dating

If the half-life of a radioactive group of atoms is 300 years, then how old is the rock if there have been three half-lives?

• 37.5 years

• 100 years

• 600 years

• 900 years

Tags

NGSS.HS-PS1-8

If you had 1000 atoms of parent isotope, then how many parent atoms would you have after 1 half-life?

• 75 atoms

• 250 atoms

• 500 atoms

• 125 atoms

Tags

NGSS.HS-PS1-8

If you had 1000 atoms of parent isotope, then how many parent atoms would you have after 2 half-lives?

• 75 atoms

• 250 atoms

• 500 atoms

• 125 atoms

Tags

NGSS.HS-PS1-8

If you had 1000 atoms of parent isotope, then how many parent atoms would you have after 3 half-lives?

• 75 atoms

• 250 atoms

• 500 atoms

• 125 atoms

Tags

NGSS.HS-PS1-8

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

• 50 years

• 100 years

• 200 years

• 300 years

Tags

NGSS.HS-PS1-8

If the half-life of a radioactive group of atoms is 100 years, then how old is the rock if there 12.5% parent isotope left?

• 50 years

• 100 years

• 200 years

• 300 years

Tags

NGSS.HS-PS1-8

Which of the following methods is used in absolute dating to determine the age of a rock?

• Radiocarbon dating

• Dendrochronology

• Thermoluminescence

• Stratigraphy

What is the principle behind radiometric dating?

• Decay of radioactive isotopes

• Growth of tree rings

• Accumulation of sediments

• Formation of ice layers

Tags

NGSS.HS-PS1-8

If a rock contains 25% of its original radioactive isotope, how many half-lives have passed?

• 1 half-life

• 2 half-lives

• 3 half-lives

• 4 half-lives

Which isotope is commonly used for dating ancient organic materials?

• Uranium-238

• Carbon-14

• Potassium-40

• Rubidium-87