Answered: Half life of a radioactive isotope is… | bartleby

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Half life of a radioactive isotope is 4x10³
years. If there are 10³ radioactive nudei
in a sample today, the number of such
nuclei in the sample 4x10⁹ year ago were:
(A)128 X10³
(B) 256X10³
(C) 512 X10³
(D) 1024 X10³

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