Q.

A radioactive sample of U238 decay to Pb through a process for which half life is 4.5 x 109 years. The ratio of number of nuclei of Pb to U238 after a time  of 1.5 x 109 years (given 21/3 = 1.26)

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answer is 2.

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A radioactive sample of U238 decay to Pb through a process for which half life is 4.5 x 109 years. The ratio of number of nuclei of Pb to U238 after a time  of 1.5 x 109 years (given 21/3 = 1.26)