Radiometric Dating

The atoms of AA decay to atoms of BB with a half-life of 100,000 years. If there are 20,000 atoms of AA to begin with, how long will it take to decay to 2,500 atoms of AA?

• 300,000 years

• 200,000 years

• 150,000 years

• 110,000 years

Tags

NGSS.HS-PS1-8

Carbon dating measures when the organism died because only then does

• Carbon-14 decay to nitrogen-14

• Carbon-14 decay to carbon-12

• Carbon-12 decay to carbon-14

• None of these

Tags

NGSS.HS-PS1-8

Radiometric dating uses radioactive isobars to get the absolute ages of rocks.

• false

• true

Tags

NGSS.HS-PS1-8

The radiocarbon dating methods cannot be used to determine the age of materials older than 4,000 years.

• false

• true

Carbon-14 decays to carbon-12 with a half-life of 5,730 years.

• false

• true

Tags

NGSS.HS-PS1-8

Carbon-14, carbon-13, and carbon-12 are example of different ______ of the same element.

• isotopes

• compounds

• products

• neutrons

The half-life Carbon-14 is 5,730 years. How much parent material is left after 5,730 years?

• 50%

• 75%

The absolute age of an igneous rock can best be determined by ...

• comparing radioactive isotopes

• comparing crystal sizes

Which of the following isotopes is commonly used in radiometric dating to determine the age of ancient artifacts?

• Carbon-14

• Uranium-238

• Potassium-40

• All of the above

Tags

NGSS.HS-PS1-8

Radiometric dating is based on the principle of radioactive decay. What does this process involve?

• The conversion of a radioactive isotope into a stable isotope over time

• The increase in mass of a radioactive isotope

• The transformation of a stable isotope into a radioactive isotope

• The splitting of an atom into smaller parts

Tags

NGSS.HS-PS1-8