The following data were collected for a phosphorescent paint being proposed for use in coating highways:
Time
(s) | Intensity
(lux) |
| 10 |
1556 |
| 20 |
787 |
| 30 |
399 |
| 40 |
202 |
| 50 |
102 |
| 60 |
52 |
| 70 |
26 |
| 80 |
13 |
| 90 |
7 |
| 100 |
3 |
The first half life was calculated to be 9.979305311089 seconds
What is the intensity of the light at the 2nd half life?
What is the intensity of the light at the 3rd half life?