| Answer | Crossword Clue |
|---|---|
| DANKE | Planck's "thanks" |
| QUANTUMTHEORY | Planck's brainchild |
| WMS | Planck's constant: pl. |
| ERG | ...-seconds (Planck's constant unit) |
| RATIO | Planck's constant, e.g. |
| QUANTUMTHEORY | Planck's Nobel prize-winning formulation |
| ATOM | One of Max Planck's interests. |
