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Biology, 29.05.2020 05:00 keke1871

An unknown element has a radioactive count of 400 counts per minute. If it has a half life of 12 minutes. How long will it take to reduce to 25 counts per minute? Show your working out and units in your answer.

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An unknown element has a radioactive count of 400 counts per minute. If it has a half life of 12 min...
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