The Danish physician in question is Niels BOHR, a Nobel Prize-winning physicist who made significant contributions to the understanding of atomic structure and quantum mechanics. He is best known for his model of the atom, which was based on the idea that electrons travel in orbits around the nucleus. The term 'Danish Physician' can be broken down into three parts: PASTRY (6 letters), KRONER (6 letters), and BOHR (4 letters). PASTRY is a type of sweet, flaky PASTRY that is popular in Denmark. KRONER is the currency of Denmark. Finally, BOHR is the surname of Niels BOHR, the Danish physicist.