A freshly prepared sample of a certain radioactive isotope has an activity of 12 mCi, Alter 9.6 minutes, its activity is 6 mCi. Find: a) The half-life, in hours. b) How many atoms of the isotope are left 2 hours after it is prepared? (choose the closest value) The first value is the half life and the second value is the number of atoms. O 0.0017, 9.0000 O 0.1600, 17693.0000 O 575.9608, 155128823180.0000 O 0.1600, 63694956.0000 O 575.9608, 63694956.0000
A freshly prepared sample of a certain radioactive isotope has an activity of 12 mCi, Alter 9.6 minutes, its activity is 6 mCi. Find: a) The half-life, in hours. b) How many atoms of the isotope are left 2 hours after it is prepared? (choose the closest value) The first value is the half life and the second value is the number of atoms. O 0.0017, 9.0000 O 0.1600, 17693.0000 O 575.9608, 155128823180.0000 O 0.1600, 63694956.0000 O 575.9608, 63694956.0000
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Transcribed Image Text:A freshly prepared sample of a certain radioactive isotope has an activity of 12 mCi. Alter 9.6 minutes, its activity is 6 mCi. Find:
a)
The half-life, in hours.
b)
How many atoms of the isotope are left 2 hours after it is prepared? (choose the closest value)
The first value is the half-life and the second value is the number of atoms.
O 0.0017, 9.0000
O 0.1600, 17693.0000
O 575.9608, 155128823180.0000
O 0.1600, 63694956.0000
O 575.9608, 63694956.0000
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