Radioactive Decay Practice

How many grams of Carbon-14 will remain after 17,100 years?

• 32 g

• 16 g

• 8 g

• 4 g

Which disintigration product is represented on the graph?

• ²⁰⁶Pb

• ⁸⁷Sr

• ⁴⁰Ar

• ¹⁴N

Tags

NGSS.HS-PS1-8

How many half-lives have passed if 12.5% ¹⁴C remains?

• 1 Half-life

• 2 Half-lives

• 3 Half-lives

• 4 Half-lives

Which index fossil would Carbon-14 be best for finding the absolute age?

• 1

• 2

• 3

• 4

Tags

NGSS.HS-LS4-1

What percentage of Rubidium-87 will remain after 4 half-lives?

• 25%

• 12.5%

• 6.25%

• 3.125%

Tags

NGSS.HS-PS1-8

The shaded boxes represent the undecayed atoms for Isotope "X". If Isotope X has a half-life of 1,000 years, how old is this sample?

• 1,000 years

• 2,000 years

• 3,000 years

• 4,000 years

Tags

NGSS.HS-PS1-8

A sample of wood that originally contained 100 grams of Carbon-14 now contains 12.5 grams. How old is this sample?

• 5.7 x 10³

• 11.4 x 10³

• 17.1 x 10³

• 22.8 x 10³

Tags

NGSS.HS-PS1-8