EASY
10th ICSE
IMPORTANT
Earn 100
Explain the term thermionic emission. Mention its one use.
Important Questions on Thermionic Emission and Radioactivity
EASY
10th ICSE
IMPORTANT
State two factors on which the rate of emission of electrons from a heated surface depends. How does it depend on the factors stated by you?
EASY
10th ICSE
IMPORTANT
State two ways to increase the rate of emission of electron from the surface.
EASY
10th ICSE
IMPORTANT
State two properties which a substance used as thermionic emitter should possess.
EASY
10th ICSE
IMPORTANT
The work function of tungsten is reduced by coating with _____.
EASY
10th ICSE
IMPORTANT
Name a substance used as cathode for thermionic emission. State its work function and the temperature to which it is to be heated for electron emission.
EASY
10th ICSE
IMPORTANT
Give reasons why an electron emitter is generally made up of tungsten coated with cesuim oxide.
EASY
10th ICSE
IMPORTANT
In a cathode ray tube, given reason for the following: (i) the filament is made of tungsten.
EASY
10th ICSE
IMPORTANT
In a cathode ray tube, given reason for the following:(ii) the cathode is coated with thorium and carbon.
