The half-life of a radioactive isotope is 10 years. about how long would it take 5 grams of the isotope to decay until there were only 2.5 grams left?

a. 10 years
b. 20 years
c. 30 years
d. 40 years

Option A. 10 years

Step-by-step explanation:

we know that

Half-life is the amount of time required for a quantity to fall to half its value as measured at the beginning of the time period.

In this problem   of a radioactive isotope is 10 years, which means that after 10 years half of the sample would have decayed and half would be left as it is.

After 10 years ( first half life) 5/2 = 2.5 g decays and 2.5 g remains left

answer: c

because if you look at the chart you can see a pattern and compare it to the question he simplify out your

but i think the formula is f(x)=6x

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