The unstable isotope 40K is used for dating rock samples. Its half-life is 1.28 x 109y. (a)

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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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Physics Principles with Applications

ISBN: 978-0321762429

7th edition

Authors: Douglas C. Giancoli

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Question Posted: Oct 25, 2010 01:57 AM

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The unstable isotope 40K is used for dating rock samples. Its half-life is 1.28 x 109y. (a)

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IDENTIFY and SET UP Find from the halflife and the number N of ...View the full answer

Physics Principles with Applications

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