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A radioactive substance has an initial count rate of 800 counts per minute. After 3 half-lives, what will be the remaining count rate? Use the half life sample context to keep Half-lives and the random nature of radioactive decay distinct from nearby atomic and nuclear radiation ideas.
- A.100 counts per minute (halflives and the random nature)
- B.1000 counts per minute (halflives and the random nature)
- C.200 counts per minute (halflives and the random nature)
- D.400 counts per minute (halflives and the random nature)
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