7.2 - Half-Life. Pg. 311

Which parent isotope has the slowest rate of radioactive decay?

Potassium 40 because it has the longest half-life.

State which isotopes would be useful for dating a material that is:

A) Carbon -14

B) Carbon-14 or potassium-40

C) Potassium-40

D) Potassium-40 or uranium

If an original 10g sample of carbon-14 decayed for 11460 years, what mass of nitrogen-14 would have been produced?

1146y/5730y = 2 half lives

Which of the three percent isotopes decays through beta decay?

carbon- 14 —> nitrogen-14

8n+6p 7n+7p

Potassium-40 —>argon-40

19p 18p