Advertisements
Advertisements
प्रश्न
Why do Free electrons not leave the metal surface on their own
Advertisements
उत्तर
Free electrons cannot leave the metal surface on their own because they do not have sufficient kinetic energy.
APPEARS IN
संबंधित प्रश्न
How can they be made to leave the metal surface? (State any two ways)
In a cathode ray tube state:
(i) the purpose of covering cathode by thorium and carbon.
(ii) the purpose of the fluorescent screen.
(iii) how is it possible to increase the rate of emission of electrons.
What do you mean by Atomic number
Define bound electrons.
Why are materials of low work function preferred as thermionic cathode materials?
What is the value of the speed of gamma radiations in air or vacuum?
Mention four properties of Becquerel rays.
A radioactive nucleus \[\ce{^A_ZX}\] undergoes spontaneous decay in the sequence \[\ce{^A_ZX -> _{Z-1 }B -> _{Z-3}C -> _{Z-2}D }\], where Z is the atomic number of element X. The possible decay particles in the sequence are ______.
Two radioactive materials A and B have decay constants 25λ and 16λ respectively. If initially they have the same number of nuclei, then the ratio of the number of nuclei of B to that of A will be "e" after a time `1/("a"lambda)` The value of a ______.
