Question

radioactive isotope has a half life of 10 years how long will it take for the activity to reduce to 3.125percent

Answer 1

7.875% ya correct ya wrong

Answer 2

let the radioactive isotope be A.

100%-------50%---------25--------12.25---------6.125------------3.06

Here 5 halflives are involved.


Radioactive decay is ist order chemical reaction..


so we can say that almost in 50 years any radioactive isotope will reduce to3.125 %.


so answer is 50 yrs