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Nuclear Decay question without knowing N0 or N ? 
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#1
May912, 03:18 PM

P: 25

1. The problem statement, all variables and given/known data
Ok so what I have an Am sample which emits alpha particles at a rate of 70Bq in 1997 and asks for the activity 8 years later (the half life of Am being 432.2 years) I found this to be 69.108 Bq, first of all does this sound right? Secondly it asks for the number of nuclei both in 1997 AND 8 years later in 2005  I have no idea to do this, is there an equation that relates the initial and final nuclei number without knowing either? 2. Relevant equations 3. The attempt at a solution 


#2
May912, 03:25 PM

P: 3,014

[tex]
A(t) = A_0 \, \exp(\lambda \, t) [/tex] A is activity and is measured in bequerel ([itex]1 \, \mathrm{Bq} = 1 \, \mathrm{s}^{1}[/itex]) 


#3
May912, 03:50 PM

P: 925

Also, A(t) = λN(t)



#4
May912, 04:00 PM

P: 25

Nuclear Decay question without knowing N0 or N ?
Yeah I sort of understand that it's just I don't know how to apply my answer for activity to find the nuclei number before and after



#5
May912, 06:11 PM

P: 3,014

see post #3.



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