Advertisements
Advertisements
Question
What is thermionic emission?
Solution
The emission of electrons from a metal surface when heat energy is imparted to it is called thermionic emission
RELATED QUESTIONS
Why do Free electrons not leave the metal surface on their own
Radioactive substances were found to give off three types of rays. Name them. How do they
(a) React to the magnetic field?
(b) React to the electric field?
(c) Act when different thickness of lead sheets is placed in their path?
Name two radioactive substances.
State three safety precautions that you would take while handling the radioactive substances.
What are ‘Becquerel rays’?
A certain nucleus has a mass number 20 and atomic number 9. Find the number of neutrons and protons present in it.
What is the value of the speed of gamma radiations in air or vacuum?
It is advised not to touch a radioactive substance by hand. Give reason.
88Ra226 experiences three α - decay. Find the number of neutrons in the daughter element.
In the following atoms, which one is a radioisotope? Give one use of this isotope.
O16, C14, N14, He4
