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Much to your surprise, you discover a radioactive sample in your backyard that was previously unknown to science. The sample decays relatively quickly. You frantically try to study it, but $6\text{ hours}$ later the sample has decayed in number by a factor of 1000.

Which of the following is the half-life of this mysterious sample?

A

$3\text{ hours}$

B

$6\text{ hours}$

C

$0.6\text{ hours}$

D

$0.87\text{ hours}$

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