Half-Life Graphs

How many parent atoms are present at time = 0?

• 0

• 10

• 20

• 5

How many parent atoms remain undecayed after 1 half-life?

• 20

• 10

• 5

• 15

Tags

NGSS.HS-PS1-8

How many of the atoms have decayed to daughter atoms after 2 half-lifes?

• 10

• 5

• 15

• 2.5

Tags

NGSS.HS-PS1-8

What is the half-life of the radioactive substance?

• 50%

• 25%

• 5 years

• 10 years

Tags

NGSS.HS-PS1-8

How much radioactive material is left after 10 years?

• 6.25%

• 50%

• 25%

• 12.5%

Tags

NGSS.HS-PS1-8

How much non-radioactive material is there after 3 half-lifes?

• 87.5%

• 25%

• 12.5%

• 75%

Tags

NGSS.HS-PS1-8

How much radioactive material remains after 20 years?

• 100%

• 25%

• 6.25%

• 3.125%

Tags

NGSS.HS-PS1-8

How many half-lifes are shown in the graph?

• 1

• 3

• 5

• 6

Tags

NGSS.HS-PS1-8

What is the half-life of mercury-203?

• 50 years

• 50 days

• 50%

• 100 days

Tags

NGSS.HS-PS1-8

What percent of mercury-203 remains after 2 half-lifes?

• 50

• 25

• 75

• 12.5

Tags

NGSS.HS-PS1-8