A certain radioactive material has an atomic mass of 172
A certain radioactive material has an atomic mass of 172 and a half-life of 505 years (take 1 yr = 365.25 d). What is the activity of 0.9 g of this material?
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a certain radioactive material has an atomic mass of 172 and a half-life of 505 years take 1 yr 36525 d what is the
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