Absolute Dating

Which method of radioactive dating would be most useful in determining the age of a human fossil?

• Carbon-14 method

• Uranium-lead method

• Potassium-argon method

• Rubidium-strontium method

A rock sample has 25% of its original radioactive element and the half-life of the element is 1,000,000 years. How old is the sample?

• 500,000 years

• 1 million years

• 2 million years

• 3 million years

The half-life of potassium-40 is 1.3 billion years. An igneous rock is found with 25% of potassium-40. What is the absolute age of this rock?

• 1.3 billion years

• 2.6 billion years

• 3.9 billion years

• 5.2 billion years

Scientists use radioactive decay to measure...

• relative time
• absolute time
• half-lives
• time of day

Tags

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

Tags

NGSS.HS-PS1-8

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

The amount of time it takes for 50% of the remaining radioactive material to decay into stable material is called:

• radiocarbon dating
• radioactive decay
• half-life
• successive decay time

Tags

NGSS.HS-PS1-8

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

• 50%

• 25%

• 12.5%

• 6.25%

Tags

NGSS.HS-PS1-8

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 term given to unstable radioactive atoms.

• Parent

• Daughter

• Half Life

• Igneous

Tags

NGSS.HS-PS1-8