Choose the best answer to the following.
A certain radioactive element has a half-life of 1 hour. If you start with a 1-gram sample of the element at noon, how much of this same element will be left at 3:00 PM?
(a) 0.5 grams
(b) 0.25 grams
(c) 0.125 grams
(d) 0.0625 grams
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