| Question | The half life of a radioactive element is eight days, how long it take to reduce it from 10mg to 5mg. |
| 1. | 4 days |
| 2. | 8 days |
| 3. | 12 days |
| 4. | 16 days |
| The correct answer is (2) |
| Question | The half life of a radioactive element is eight days, how long it take to reduce it from 10mg to 5mg. |
| 1. | 4 days |
| 2. | 8 days |
| 3. | 12 days |
| 4. | 16 days |
| The correct answer is (2) |