Answer:
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 :
[tex]N=\frac{N_o}{2^n}[/tex]
where,
N = amount of radioactive sample remains after n-half lives = ?
[tex]N_o[/tex] = Initial amount of the radioactive sample= 10 g
n = number of half lives = 3
[tex]N=\frac{10 g}{2^3}=1.25 g[/tex]
1.25 g of radioactive isotope will remain in the sample after 3 half-lives.
