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Fyzika

21084Po je zářič alfa. Poločas jeho rozpadu je 140 dní. Za jak dlouho bude vzorek obsahovat 3/4 olova 20682Pb?

²¹⁰₈₄Po je zářič alfa. Poločas jeho rozpadu je 140 dní. Za jak dlouho bude vzorek obsahovat 3/4 olova ²⁰⁶₈₂Pb?