Question

if a radioisotope completes three half lives, then its parent daughter ratio would be - 1)1:3 2)3:4 3)1:7 4)1:15
​

Answer 1

log F = (N/H)log(1/2) where: F = fraction remaining N = number of years and H = half life. To determine the fraction still remaining, we must know both the amount now present and also the amount present when the mineral was formed.

please my answer brainliest.