Half - Lives of Radioactive Isotopes

How much of a 100.0g sample of Au - 198 is left after 8.10 days if its half - life is 2.70 days?

• 12.5 g

• 25.0 g

• 50.0 g

• 6.25 g

The half - life of radon - 222 is 3.8 days. How much of a 100 g sample is left after 15.2 days.

• 50.0 g

• 25.0 g

• 12.5 g

• 6.25 g

A 50.0 g sample of N - 16 decays to 12.5 g in 14.4 seconds. What is it's half - life?

• 14.4 sec

• 7.2 sec

• 3.6 sec

• 1.8 sec

Tags

NGSS.HS-PS1-8

The half - life of K - 42 is 12.4 hrs. How much of a 750 g sample is left after 62.0 hrs?

• 187.5 g

• 93.8 g

• 46.9 g

• 23.4 g

If 100 g of Au - 198 decays to 6.25 g in 10.8 days, what is the half - life of Au - 198?

• 1.8 days

• 2.7 days

• 3.6 days

• 5.4 days

Tags

NGSS.HS-PS1-8