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The radioactive nuclide Plutonium-199 has a half-life of 43.0 min. A sample is prepared that has...

The radioactive nuclide Plutonium-199 has a half-life of 43.0 min. A sample is prepared that has an initial activity of 7.56 ×1011 Bq.
i. How many Plutonium-199 nuclei are initially present in the sample?
ii. How many are present after 30.8 min?
iii. What is the activity at this time?

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