Carbon-14

If the half-life of a radioactive group of atoms is 100 years, then how old is the rock if there have been ten half-lives?

• 10 years

• 100 years

• 1000 years

• 10000 years

Tags

NGSS.HS-PS1-8

After four half-lives, what fraction of the original parent isotopes remain?

• 1/4

• 1/16

• 1/8

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 have been two half-lives?

• 25 years

• 200 years

• 400 years

• 800 years

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

• daughter element

• half-life

• parent element

• carbon-14

Tags

NGSS.HS-PS1-8

Which of the following best describes the nucleus of an atom of carbon-14?

• Eight protons, six neutrons

• Six protons, eight neutrons

• 10 protons, four neutrons

• Four protons, 10 neutrons

Tags

NGSS.MS-PS1-1

Let's say you have a sample of 10 milligrams of carbon-14. How many milligrams will you have in 5,700 years?

• 0 mg

• 5 mg

• 10 mg

• 20 mg

Tags

NGSS.HS-PS1-8

What can you learn about an organism from the amount of carbon-14 in its remains?

• How long ago it died.

• What its diet consisted of.

• Which biological kingdom it belonged to

• Which living animals it's most closely related to.

How is an isotope different from the standard form of a chemical element?

• It has a different number of positrons.

• It has a different number of electrons

• It has a different number of neutrons

• It has a different number of protons.

Tags

NGSS.HS-PS1-8

What is the relationship between carbon-14 and nitrogen?

• Nitrogen and carbon-14 react to form radioactive elements

• Over time, nitrogen becomes carbon-14.

• Over time, carbon-14 becomes nitrogen

• Carbon-14 can be used to date ancient nitrogen.

When an unstable radioactive atom decays, it usually turns into:

• a more stable atom

• a less stable atom

• the exact same atom but with less pure energy

• empty space

Tags

NGSS.HS-PS1-8