Question

How many half-lives would something have gone through if you had 75% daughter product and 25% parent?

Answer 1

Two Half-lives

Step-by-step explanation:

Let number of Parent nuclei Initially present be X,

Then, finally
`(X)/(4)` Parent nuclei Will remain with
`(3X)/(4)` daughter nuclei.

In one half- life , parent nuclei becomes half of initial.

So, starting with X parent nuclei,

After one half-life, it will degrade to
`(X)/(2)` .

After another half life , Parent nuclei will become half of
`(X)/(2)`

Which is equal to
`(X)/(4)`.

So, Parent nuclei have to go through Two half-lives.