the half -life of a radioactive isotope is the time it takes for a quantity of the isotope to be reduced to half its initial mas
s. starting with 155 gramsbof a radioactive isotope, how much will be left after 3 half-lives?
1 answer:
Answer:
after 3 half lives the amount should be reduced to 19.375g
Step-by-step explanation:
after the first half life , amount left =
155÷2
= 77.5g
2nd half life
77.5÷2
=38.75g
3rd Half life
38.75÷2
=19.375g
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