A radioactive sample has 8.0 * 10^18 active nuclei at a certain instant. How many of these nuclei will still be in the active state after two half-lives (in * 10^18)?

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A radioactive sample has 8.0 * 10^18 active nuclei at a certain instant. How many of these nuclei will still be in the active state after two half-lives (in * 10^18)?
20
Oct
A radioactive sample has 8.0 * 10^18 active nuclei at a certain instant. How many of these nuclei will still be in the active state after two half-lives (in * 10^18)? A radioactive sample has 8.0 * 10^18 active nuclei at a certain instant. How many of these nuclei will still be in the active [...]
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