Advertisements
Advertisements
प्रश्न
What is thermionic emission?
Advertisements
उत्तर
The emission of electrons from a metal surface when heat energy is imparted to it is called thermionic emission
संबंधित प्रश्न
Name the radiations which are absorbed by greenhouse gases in the earth’s atmosphere.
Answer the following questions based on a hot cathode ray tube
Name the charged particles
What are free electrons?
An element `""_ZS^A` decays to `""_85R^222` after emitting 2 α particles and 1 β particle.
Find the atomic number and atomic mass of the element S.
Give one example of isobars.
An element P disintegrates by α - -emission and the new element suffers two further disintegrations, both by β -emission, to form an element Q. Explain the fact that P and Q are the isotopes.
In a cathode ray tube state. How is it possible to increase the rate of emission of electrons.
Are all the radiations viz. α, β and γ emitted in a single radioactive decay?
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 ______.
Calculate the time interval between 33% decay and 67% decay if half-life of a substance is 20 minutes.
