Question

A sample starts with 1000 radioactive atoms. How many half-lives have elapsed when 875 atoms have decayed?

I am not sure how to solve this, please help!!

Answer 1

see Sidiqi's post below

Answer 2

I got 0.193 half-lives. Does this answer make sense??

Answer 3

makes sense to me. After 1 half-life there will only be 500 atoms, so it will be less than that.
Your answer is correct.

Answer 4

there will be three half lives when sample is decreased from 1000g to 875g.....

Answer 5

caca man

Answer 6

yall are down tremendously