a)
Halbwertszeit r
0.5^(t/r) = EXP(LN(0.5^(t/r))) = EXP(t/r*LN(0.5)) --> λ = LN(0.5) / r
b)
0.5^(t/30) = 0.1 --> t = 99.66 Jahre
λ = LN(0.5) / 30 = - 0.02310
↧
Beantwortet: Zerfallgesetz radioaktiver Substanzen N(t) = N_0*e^(λ*t)
↧