The surname's the same.  The first conducted an experiment confirming the quantum nature of atomic energy levels with James Franck, for which he shared part of the 1925 Nobel Prize in Physics.
The surname's the same.  The first conducted an experiment confirming the quantum nature of atomic energy levels with James Franck, for which he shared part of the 1925 Nobel Prize in Physics. The second, uncle of the first, proved heat and light are electromagnetic and was the first to broadcast and receive radio signals.  For ten points, give the common surname of these German physicists, also a unit of frequency.
The surname's the same.  The first conducted an experiment confirming the quantum nature of atomic energy levels with James Franck, for which he shared part of the 1925 Nobel Prize in Physics.
Hertz (Gustav and Heinrich, respectively)