Of what is the electron source of an electron microscope,the cathode,composed?
A)a tungsten wire filament
B)an iron wire filament
C)a titanium wire filament
D)an iron spike filament
E)a tungsten spike filament

Question

Quizplus · Accepted Answer

The electron source of an electron microscope, the cathode, is composed of a tungsten wire filament. This filament is heated up, and as a result, electrons are emitted from its surface, which are then focused to form an electron beam.

Of What Is the Electron Source of an Electron Microscope,the