Level 2
Level 2 requires school mathematics. Suitable for pupils.

# IllustrationRadioactive decay law (N-t graph)

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Decay law represents the number $$N$$ of atomic nuclei not yet decayed at the time $$t$$. At the beginning, i.e. at the time $$t=0$$ there were $$N_0$$ of not yet decayed nuclei (initial number). With the time this number decreases exponentially.