12455 cs has a half-life of 308sa if we have 53microg, Ask an Expert

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124/55 Cs has a half-life of 30.8s.

(a) If we have 5.3µg initially, how many Cs nuclei are present?

(b) How many are present 2.0min later?

(d) After how much time will the activity drop to less than about 1 per second?

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