1. The number of nuclei in a radioactive sample decreases to one fourth (25.0%) of the original number in 9.00 hours. At the end of the 9 hours it contains 2.50x10¹0 undecayed nuclei. (a) What is the activity of the sample at this time? (b) What will be the activity of the sample after 6.00 more hours? (c) How much more time (in addition to the 6.00 hours) must the nurse wait before she can administer it to the patient, if the activity must not be greater than 1.6x10 Bq? Be careful with the units!
1. The number of nuclei in a radioactive sample decreases to one fourth (25.0%) of the original number in 9.00 hours. At the end of the 9 hours it contains 2.50x10¹0 undecayed nuclei. (a) What is the activity of the sample at this time? (b) What will be the activity of the sample after 6.00 more hours? (c) How much more time (in addition to the 6.00 hours) must the nurse wait before she can administer it to the patient, if the activity must not be greater than 1.6x10 Bq? Be careful with the units!
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1. The number of nuclei in a radioactive sample decreases to one fourth ( 25.0%) of the original number in
9.00 hours. At the end of the 9 hours it contains 2.50x10¹0 undecayed nuclei. (a) What is the activity of the
sample at this time? (b) What will be the activity of the sample after 6.00 more hours? (c) How much more
time (in addition to the 6.00 hours) must the nurse wait before she can administer it to the patient, if the
activity must not be greater than 1.6x10³ Bq? Be careful with the units!
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