Assertion: cathode's electron | /r/HasProperty | free to move
Facets:
Source sentences:
text: Figure (a) shows the surface of a metal containing a large number of electrons which are free to move.
text: In a vacuum tube or electronic vacuum system, the cathode is a metal surface which emits free electrons into the evacuated space.
text: The electrons are free to move at the surface but remain inside the metal.