(II) 155Cs has a half-life of 30.8 s. (a) If we have 7.8
Chapter , Problem 48(choose chapter or problem)
(II) 155Cs has a half-life of 30.8 s. (a) If we have 7.8 figinitially, how many Cs nuclei are present? (b) How manyare present 2.6 min later? (c) What is the activity at thistime? (d) After how much time will the activity drop to lessthan about 1 per second?
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