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T=15/3=5min
N(t) = No*(1/2)^(t/T1/2) N(t) = 1/8No (z danych zadania)
1/8No = No*(1/2)^(t/T1/2) /No
1/8 = (1/2)^(t/T1/2)
(1/2)³ = (1/2)^(t/T1/2)
3 = t/ T1/2 t = 15 min
3 = 15 / T1/2
T1/2 = 15/3 = 5 min GOTOWE!!!