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- Radioaktivitas
1][
zX^A → (z-1)X^A + e
nomor atom berkurang 1 → z-1
nomor massa tetap → A
2][
waktu paruh
A = Ao • (½)^(t/T)
A/Ao = (½)^(t/T)
⅛ = (½)^(12/T)
12/T = 3
T = 4 tahun ← jwb
aktivitas setelah waktu t
A = Ao • (½)^(t/T)
A/Ao = (½)^(t/T)
A/Ao = (½)^(8/4)
A/Ao = ¼ ← jwb
3][
massa Bi tersisa setelah waktu t
m = mo • (½)^(t/T)
m = 72 • (½)^(15/5)
m = 72 • ⅛
m = 9 gr
massa Po terbentuk
m = 72 - 9
m = 63 gr ← jwb