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Suppose you have 50 grams of a radioactive isotope with a half-life of 2 years. How much of the isotope will you have after 4 years?

A50 g
B25 g
C12.5 g
D6.25 g

Verified Answer :

The answer is C 12.5 g because after 2 years, 50 g goes to 25, and after another 2 years, it goes to 12.5 g

Answer: C

Flippo

50/2 = 25
25/2 = 12.5

In 4 years there will be 12.5 g  of the radioactive isotope left 

Hope this helps :)

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