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Klikněte na tlačítko "Pokračovat" a vyhledávejte na základě vašich odpovědí.As you can see, the substance initially has 100% of its atoms, but after its first half life (5 years) only 50% of the radioactive atoms are left.Literally, half of the substance is gone every five years (the half life of this particular substance).So, in our example , after the second life is over (that's 10 years since each half life is 5 years), there will be $$\frac 1 2$$ of $$50\%$$ of the substance left, which, of course is $$25 \%$$.However, to read any clock accurately we must know where the clock was set at the beginning.