Advertisements
Advertisements
Question
Define free electrons.
Advertisements
Solution
Electrons in outer orbits are weakly bound with the nucleus. In solids these weakly bound electrons leave their individual atom and become a part of it. These electrons are known as free electrons.
RELATED QUESTIONS
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
What is thermionic emission?
Complete the diagram as given above by drawing the deflection of radioactive radiations in an electric field
What do you mean by Atomic number
In the following fig. shows a radioactive source S in a thick lead container. The radiations pass through an electric field between the plates P and Q. Complete the diagram to show the paths of α , β and γ radiations.
Why is the source S placed in a thick lead container?
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?
A radioactive source emits three types of radiations.
Name the radiation which has the highest ionizing power.
Which of the following statements is/are correct?
- α particles are photons
- Penetrating power of γ radiation is very low
- Ionization power is maximum for α rays
- Penetrating power of γ radiation is very high
