In the decay of a radioisotope after two half lives have elapsed what proportion of the original parent element w remain O 0 50

Question

In the decay of a radioisotope after two half lives have elapsed what proportion of the original parent element w remain O 0 50 0 75 O 0 125 O 0 25 Isotope amount 100 90 80 23292 70 60 30 20 10 D Graph of Radioactive Isotope Decay Parent Isotope Daughter Product 2 3 45 Age number of half lives 0 9 O 10

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