A radioactive nucleus has a half-life of 5 x 108 years. Assuming that a sample of rock (say, in an asteroid) solidified right after the solar system formed, approximately what fraction of the radioactive element should be left in the rock today?

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Answer:So the present mass will be 0.0017002 times of the initial mass of the sample.

Explanation:Given:

Let the initial quantity on the formation of the solar system be,Then the final quantity at present be:

So the present mass will be 0.0017002 times of the initial mass of the sample.