| Answer | Crossword Clue |
|---|---|
| ERNEST | ... Rutherford, the Father of Nuclear Physics |
| RUTHERFORD | Father of Nuclear Physics |
| supercritical | (in nuclear physics) Containing or involving more than the critical mass |
| subcritical | (in nuclear physics) Containing or involving less than the critical mass |
| HYMAN | Rickover known as the Father of the Nuclear Navy |
| GALILEO | The Father of Modern Physics |
