12455 cs has a half-life of 308s if we have 53microg


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?

(c) What is the activity at this time?

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

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Physics: 12455 cs has a half-life of 308s if we have 53microg
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