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प्रश्न
Define free electrons.
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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.
संबंधित प्रश्न
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?
What are the uses of radioactive isotopes in following?
(a) Medical field,
(b) Agriculture,
(c) Industries?
Explain, why radium paint, consisting of zinc sulphide and a trace of radium salt, glows in the dark?
Mention four properties of Becquerel rays.
Mention one important function of ear main parts:
State the principle on which the functioning of a nuclear reactor is based.
Heavy radioactive elements eventually turn into ______.
A radioctive sample decays `7/8` times its original quantity in 15 minutes. The half-life of the sample is ______.
Complete the following radioactive reaction:
\[\ce{^-_-X -> ^-_-Y + ^4_2He -> ^234_91Z + ^0_-1e}\]
In the discovery of radioactivity, why could the darkening of the covered photographic plate NOT be explained by ordinary visible light?
