Question

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 of this same element will be left at 3:00 PM?
(a) 0.5 g
(b) 0.25 g
(c) 0.125 g
(d) 0.0625 g
@Abhisar

Answer 1

Hello @beccamarx19 !

Answer 2

Hmm noon means 12 PM, so 3 half lifes have elapsed.

Answer 3

I taught u the formula for calculating the % remaining earlier. Using that one we can calculate the answer

Answer 4

Here, n= 3
\(\huge\frac{1}{2^3}\) = 1/8 of the original amount i.e 1/8 of 1g = 0.125g