Element a decays into element b the half-life for this, Ask an Expert

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Element A decays into element B. The half-life for this decay is 1000 years. The atomic weight of both elements is approximately 10 u.

A) What is the decay constant?

B) If the original A/B ratio is .9, but a sample has a ratio of .2, how old is the sample?

C) What is the activity of a gram of pure element A?

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