Question

Assume each trial ( roll of cubes) represents 1000 years. Imagine that you found a rock sample was 25% Lokium and 75% DOL, how would the rock sample be given the half-life you figured out? Show your work

Answer 1

Assuming each trial represents 1000years, and rock samples were found, the rock sample will be given half-life of

• The rock sample will be $2000years$ old

Isotope

We know that the parent Isotope remaining is given by the expression

$\frac{1}{2}^n$

where,

n = number of half lives passed

lokium Isotope

From the question, the parent Isotope remaining is $25\%$ lokium

$0.25 = \frac{1}{4} = \frac{1}{2^2} = \frac{1}{2}^2$

Therefore,

$\frac{1}{2}^2$ means 2 half lives have passed.

If from the question,

1 half life = 1000years

Rock age

Therefore,

The rock sample's age = $2*1000 = 2000years$

For more information on rock samples such as lokium and DOL , visit

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