Answer:

Step-by-step explanation:
Half Life:
- The time in which half of the radioactive substance decays is known as its half life.
Solution:
Atoms = 10,000
After 1st half life:
= 10,000 / 2
= 5,000 atoms
After 2nd half life:
= 5,000 / 2
= 2500 atoms
So, after 2 half lives, 2500 atoms remain.
![\rule[225]{225}{2}](https://img.qammunity.org/2024/formulas/mathematics/high-school/yk3l6bxs46equldxx0z8qla0zuvm8l328e.png)