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Equation for nuclear decay

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    Activity = lambda x (N)

    My question is that is N always the inital number of atoms because in the edexcel revision book it states otherwise??

    Thanks
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    It is the number of atoms at the point where activity is the value you are using.

    That is. If the activity is 20 at the start, and lambda is 1, then N is 20. If you come back and the activity has fallen to 10, then N is 10.

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