| 100% | ERNEST | 6 | ___ Rutherford, a.k.a. the Father of Nuclear Physics |
| 78% | ERNEST | 6 | ___ Rutherford, the Father of Nuclear Physics |
| 75% | ERNEST | 6 | ___ Rutherford, New Zealand physicist known as the father of nuclear physics |
| 70% | ERNEST | 6 | Rutherford known as "The Father of Nuclear Physics" |
| 62% | ERNEST | 6 | Rutherford who's regarded as the founder of nuclear physics |
| 57% | ANTOINE | 7 | ___ Lavoisier a.k.a. the Father of Modern Chemistry |
| 54% | GALILEO | 7 | The Father of Modern Physics |
| 52% | APOLLOCREED | 11 | Fictional boxer a k a The Count of Monte Fisto |
| 51% | HOYLE | 5 | Edmond ___ a.k.a. the "Father of Whist" |
| 48% | MELTDOWN | 8 | The overheating of a nuclear reactor |
| 47% | HYMAN | 5 | Rickover known as the Father of the Nuclear Navy |
| 47% | KRONOS | 6 | Father of Poseidon and Zeus, with a K |
| 46% | BOSONSOLVER | 11 | Person who's figured out the properties of a physics particle? |
| 46% | XRAYDIFFRACTION | 15 | Process showing the structure of a crystal, in physics |
| 46% | GEIGER | 6 | The “G” of a G-M tube, in physics |
| 45% | HAYDNGOSEEK | 11 | Part of a children's game with the Father of the Symphony? |
| 45% | EGGDROP | 7 | Physics demonstration often done from the roof of a school |
| 45% | PARENTING | 9 | Taking on the role of a mother or father |
| 45% | IRAN | 4 | Country at the center of a 2015 nuclear deal |
| 44% | FREDANDREWS | 11 | A "Riverdale" character who is the father of 31a, played by actor Luke Perry: 2 wds |
| 44% | TAE | 3 | Kim ___-hyung, a.k.a. V of the K-pop group BTS |
| 44% | BOHR | 4 | Namesake of a physics institute at the University of Copenhagen |
| 44% | LON | 3 | McEachern a.k.a. the "Voice of Poker" |
| 43% | EGEUS | 5 | Father of Hermia in the William Shakespeare play A Midsummer Night's Dream |
| 43% | HETTY | 5 | ___ Green a.k.a. the Witch of Wall Street |
| 43% | ALANRITCHSON | 12 | "Reacher" actor who plays the father of a critically ill girl in "Ordinary Angels" (2 wds.) |
| 43% | BOYLESLAW | 9 | Physics rule relating the pressure of a gas to the size of its container |
| 43% | CHESTERTON | 10 | G K —, author of 1911 story collection The Innocence of Father Brown |
| 43% | ALBEDO | 6 | In physics, the fraction of the incoming light reflected by a planet |
| 43% | INCA | 4 | ___ Empire, a.k.a. the Realm of the Four Parts |