A certain radioactive element has a half life of 1 h. If you start with a 1-g sample of the element at noon, how much is left at 3:00 PM? At 6:00PM? At 10:00 PM?

Answer 1

1.0 g/2ⁿ = ??
where n is the number of half lives.
1/2³ = 1/8 g or 0.125
The others are done the same way.

Answer 2

i have no idea