When a metal is heated to a high temperature, electrons a...
When a metal is heated to a high temperature, electrons are emitted from its surface. The process is known as
photoelectric effect
thermionic emission
field emission
secondary emission
radioactive emission
Correct answer is B
The process by which free electrons are emitted from the surface of a metal when external heat energy is applied is called thermionic emission.
In measuring high frequency a.c, the instrument used is the ...
When temperature of a liquid increases, its surface tension ...
Siphon will fail to work if ...
A satellite is in a parking orbit if its period is ...
The particle and wave nature of matter are demonstrated in the equation...