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A radioactive isotope has a half-life of 72.0 min. A sample is prepared that has an...

A radioactive isotope has a half-life of 72.0 min. A sample is prepared that has an initial activity of 1.40×1011 Bq.

Q1: How many radioactive nuclei are initially present in the sample?

Q2: How many are present after 72.0 min?

Q3: What is the activity after 72.0 min?

Q4: How many are present after 144 min?

Q5: What is the activity after 144 min?

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