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k = 100 m⁻¹
I = Io·e^(-k·x) i I = Io/1000
Io/1000 = Io·e^(-k·x)
1/1000 = e^(-k·x)
ln(1/1000) = -k·x ------> x = ln1000/k = 3·ln10/k = 3·2.3/100 = 0.069 m
x = 6.9 cm