Advertisements
Advertisements
प्रश्न
State two characteristics of the substance used as thermionic emitter.
Advertisements
उत्तर
(i) The substance must have high melting point.
(ii) The work function of the substance should be low so that electrons may be emitted even at low temperature.
संबंधित प्रश्न
When does the nucleus of an atom tend to become radioactive?
Answer the following questions based on a hot cathode ray tube
Name the charged particles
State three factors on which the rate of emission of electrons from a metal surface depends
Under which conditions does the nucleus of an atom tend to radioactive?
What is meant by radioactivity?
What kind of change takes place in a nucleus when a β -particle is emitted?
A radioactive source emits three types of radiations.
Name the radiation which has the highest ionizing power.
Mention four properties of Becquerel rays.
A radioactive element is placed in an evacuated chamber. Then the rate of radioactive decay will ______.
