One isotope of silicon, Si-32, has a half-life of 150 years. If there were 300 atoms of silicon initially, approximately how many atoms will be left after 150 years?
start with 300 atoms - after 150 yrs, half are gone -150 remain. 150 years after that, half of the remaining 150 will be gone and you are down to 75. After the 3rd 150 year stretch, half of those will be gone and you have 37.5 atoms left. [ You can't have half an atom, so call it 37 or 38. With very large numbers of atoms, you wont run into the half an atom problem for a very very long time -
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