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t½ = 28 hari
No = 0,8 gram
N = 0,5 gram
Ditanya :
T = ....?
(N / No) = (½)^{ T / t½ }
(0,5 / 0,8) = (½)^{T / t½}
⅝ = (½)^{T / t½}
T / t½ = log ⅝ / log ½
T / t½ = 0,678
T / t½ = 0,678
T = 0,678 × t½
= 18,98 hari