hard · MCAT chem-phys
A radioactive sample contains a mixture of isotope X (half-life = 4 days) and isotope Y (half-life = 12 days), initially present in equal numbers of atoms N_0.
After 12 days, what is the ratio of remaining atoms of X to remaining atoms of Y?
- 1:2
- 1:4
- 1:1
- 3:1
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