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प्रश्न
Define the term radioactivity.
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उत्तर
The phenomenon of spontaneous disintegration of an unstable nucleus of a naturally occurring isotope accompanied by emission of active radiations, α particles, β particles and γ radiations is called radioactivity.
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संबंधित प्रश्न
Arrange α, β, and γ rays in ascending order with respect to their
1) Penetrating power.
2) Ionising power
3) Biological effect
Give the relative ionizing power of α, β and γ radiations.
Why should a radioactive substance not be touched by hands?
Why are materials of low work function preferred as thermionic cathode materials?
Name the three main parts of a Cathode Ray Tube.
Name the Different Radiations Which Are Emitted by the Radioactive Substances.
Are all the radiations mentioned by you, emitted in a single radioactive decay?
Heavy radioactive elements eventually turn into ______.
The half-life of a radioactive nuclide is 100 hours. The fraction of original activity that will remain after 150 hours would be ______.
If 10% of a radioactive substance decays in every 5 years, then the percentage of the substance that will have decayed in 20 years will be ______.
In the following atoms, which one is a radioisotope? Give one use of this isotope.
O16, C14, N14, He4
