Advertisements
Advertisements
प्रश्न
Define free electrons.
Advertisements
उत्तर
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.
APPEARS IN
संबंधित प्रश्न
Why do Free electrons not leave the metal surface on their own
A radioactive substance is oxidized. Will there be any change in the nature its radioactivity? Give a reason for your answer
State any two precautions to be taken while handling radioactive substances
A nucleus `""_11^24Na` emits a beta particle to change into Magnesium (Mg)
(i) Write the symbolic equation for the process.
(ii) What are numbers 24 and 11 called?
(iii) What is the general name of `""_12^24Mg `with respect to `""_11^24Na` ?
Radiations given out from a source when subjected to an electric field in a direction perpendicular to their path are shown below in the diagram. The arrows show the path of the radiation A, B and C. Answer the following questions in terms of A, B and C.
1) Name the radiation B which is unaffected by the electrostatic field.
2) Why does the radiation C deflect more than A?
3) Which among the three causes the least biological damage externally.
4) Name the radiation which is used in carbon dating.
An electromagnetic radiation is used for photography in fog. [2]
(i) Identify the radiation.
(ii) Why is this radiation mentioned by you, ideal for this purpose ?
Give the relative ionizing power of α, β and γ radiations.
What are the uses of radioactive isotopes in following?
(a) Medical field,
(b) Agriculture,
(c) Industries?
A radioctive sample decays `7/8` times its original quantity in 15 minutes. The half-life of the sample is ______.
