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A2 Physics Edexcel Nuclear Radiation help (Activity)

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    Q: Half life of N^16 is 7.1s
    (a) I already did part (a) = 0.098)
    (b) Show that the time taken for the mass of N^16 in a sample to decrease from 5.0(micro)g to 1.0(micro)g is approximately 16s.

    The mark scheme used the N = Noe^-decayconstant(t)

    But I thought N meant the number of unstable nuclei? They subbed in 5 and 1, aren't they masses in the sample?

    The number and the masses of the unstable nuclei are directly proportional. Increase the number, and the mass increases too.
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