124/55Cs has a half-life of 30.8 s. a) If we have 8.5ug initially, how many Cs nuclei are presentc? b) How many nuclei are present 2.6 min later? c) What is the activity at this time? d) After how much time will Ithe activity drop to less than about 1 per second?

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124/55Cs has a half-life of 30.8 s. a) If we have 8.5ug
initially, how many Cs nuclei are presentc? b) How
many nuclei are present 2.6 min later? c) What is the
activity at this time? d) After how much time will Ithe
activity drop to less than about 1 per second?
Transcribed Image Text:124/55Cs has a half-life of 30.8 s. a) If we have 8.5ug initially, how many Cs nuclei are presentc? b) How many nuclei are present 2.6 min later? c) What is the activity at this time? d) After how much time will Ithe activity drop to less than about 1 per second?
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