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.
It is easier to roll a stone up a sloping road than to lift it vertical upwards because ...
When a pure semiconductor is heated, its resistance? ...
Light Emitting Diodes (LED) used in fancy electronic devices such as toys, emit ...
One of the following readings represents the measurement of the length of a metal rod using ver...
Which of the following pairs of physical quantities is made up of vectors? ...
Materials for rain-proof coats and tents owe their water-proof properties to ...
Which of the following radiations cannot be deflected by a magnetic field? ...