Question: 124/55Cs has a half-life of 30.8s. (a) If we have 8.8g initially, how many Cs nuclei are present? (b) How many are present 2.0min later?

124/55Cs has a half-life of 30.8s.
(a) If we have 8.8μg initially, how many Cs nuclei are present?
(b) How many are present 2.0min later?
(c) What is the activity at this time?
(d) After how much time will the activity drops to less than about 1 per second?

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