A 10 gram sample of radioactive material having a half life of exactly five minutes was brought to the Great Basin Chemistry lab at exactly 9:00 AM. How much of this radioactive material was left by 9:30 AM?
- 0.15625 grams
- 0.3125 grams
- 0.0625 grams
- 0.0325 grams
- 0.01525 grams