Electronic Devices and Circuits - Engineering

Q1:

Secondary emission results

A when temperature of metals is raised to a level above the crystallization temperature

B when metals are subjected to strong magnetic fields

C when light rays fall on the metal surface

D when a high velocity beam of electrons strikes as metal surface

ANS:B - when metals are subjected to strong magnetic fields

Definition of Primary emission.

Electron emission arising from the irradiation including thermal heating or the application of a strong electric field to a surface.