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Chemistry, 29.06.2019 01:00 bchamp2005p5upqx
There's a 50 gram sample of our ra-229 it is half-life is 4 minutes how much will be left after 12 minutes
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There's a 50 gram sample of our ra-229 it is half-life is 4 minutes how much will be left after 12 m...
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