Asample contains 10 g of a radioactive isotope. how much radioactive isotope will remain in the sample after 3 half-lives?

1.25 g of radioactive isotope will remain in the sample after 3 half-lives.

Explanation:

Formula used to calculate the number of half life elapsed :

where,

N = amount of radioactive sample remains after n-half lives = ?

= Initial amount of the radioactive sample= 10 g

n = number of half lives  = 3

1.25 g of radioactive isotope will remain in the sample after 3 half-lives.

b is the correct answer

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