Question

I WILL MEDAL AND FAN, 1 QUICK QUESTION!!!
You started with 64 g of a radioactive substance. If you have 4.0 g of that substance left, then how many half-lives have elapsed?

5

4

3

2

Answer 1

i thinks it's 3

Answer 2

firstly 64:2=32 then 32:2=16 then 16:2=8 then 8:2=4 so it's 4 sorry

Answer 3

wait option four or the actual number four? @sparrow2

Answer 4

actual numebr 4 so option 2

Answer 5

thanks! could you help me on a few other separate questions? ill give you a separate medal for each? @ sparrow2