(Answered) A 10 gram sample of radioactive material having a half life

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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

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