Half-Life Practice

Front

What is half-life?

Back

Half-life is the time required for half of the radioactive atoms in a sample to decay.

Front

If a substance has a half-life of 8 days, how much of a 10 mg sample remains after 8 days?

Back

5 mg

Front

If a substance has a half-life of 8 days, how much of a 10 mg sample remains after 16 days?

Back

2.5 mg

Front

If a substance has a half-life of 8 days, how much of a 10 mg sample remains after 24 days?

Back

1.25 mg

Front

What is the half-life of barium-122?

Back

2 minutes

Front

If a fresh sample of barium-122 weighs 80 g, how much remains after 10 minutes?

Back

2.5 g

Front

What is the formula to calculate remaining mass after a certain number of half-lives?

Back

Remaining mass = Initial mass * (1/2)^(time elapsed / half-life)