Question: The unstable isotope 40K is used for dating rock samples. Its half-life is 1.28 x 109y. (a) How many decays occur per second in a

The unstable isotope 40K is used for dating rock samples. Its half-life is 1.28 x 109y.
(a) How many decays occur per second in a sample containing 1.63 x l0-6g of 40K?
(b) What is the activity of the sample in curies?

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