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8 September, 09:35

Radium-221 has a half-life of 30 s. how long will it take for 95% of a sample to decay

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  1. 8 September, 13:28
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    Radium-221 has a half-life of 30 s. how long will it take for 95% of a sample to decay

    this would be 2.22 seconds
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