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Chemistry, 24.05.2021 21:00 maysahdabest
After 20 days, a 120 kg sample of Bi-209 decays down to 15 kg. What is its half-life?
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Chemistry, 22.06.2019 23:20, svaskeacevilles5477
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After 20 days, a 120 kg sample of Bi-209 decays down to 15 kg. What is its half-life?...
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