September 2018 1 40 Report
Peluruhan radioaktif ²⁰⁶Tl menjadi ²⁰⁶Pb memiliki waktu paruh 4,20 menit. Mula-mula terdapat 5,00.10²² atom ²⁰⁶Tl, hitunglah jumlah atom sisa setelah 42,0 menit.
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