Assertion: cathode ray tube's emission | /r/HasProperty | depend on energy
Facets:
value: from photons rather than thermionic emission
type: OTHER
value: in those cases
type: TEMPORAL
Source sentences:
text: Phototubes and photomultipliers rely on electron flow through a vacuum, though in those cases electron emission from the cathode depends on energy from photons rather than thermionic emission.