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?

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

Explanation:

Given:

half life of the given sample, We know that solar system came in to existence approximately years ago.

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.

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The modern-day generator works on the principle of electromagnetic induction discovered by michael faraday in 1831-32. faraday discovered that the above flow of electric charges could be induced by moving an electrical conductor, such as a wire that contains electric charges, in a magnetic field.