- 2b. Assume you have a sample of atoms with a half-life of 0.5 second. Approximately how much (in %) of the original sample will be around after 3.5 seconds? * Choose the answer closest to the exact value.
- 0.1%
- 0.3%
- 1%
- 3%
- 10%
- 30%
- 100%
2c. Potassium-40 decays to Argon-40 with a half-life of 1.25 billion years old. If at the formation of the Earth we had 100% Potassium-40 and 0% Argon-40, what should be ratio of Potassium-40 / Argon-40 on the Earth today? * choose closest answer
- 0.05
- 0.09
- .40
- 0.91
- 1.1
- 2.5
- 3.6
- 11.5
- 20
- 100