Question

what is cold and hot cathod​

Answer 1

Answer:

A cold cathode is a cathode that is not electrically heated by a filament. A cathode may be considered "cold" if it emits more electrons than can be supplied by thermionic emission alone. ... The other type of cathode is a hot cathode, which is heated by electric current passing through a filament.

Answer 2

Answer:

A cold cathode is a cathode that is not electrically heated by a filament. A cathode may be considered "cold" if it emits more electrons than can be supplied by thermionic emission alone. ... The other type of cathode is a hot cathode, which is heated by electric current passing through a filament.