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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
A radiation X is focused by a particular device on the bulb of a thermometer and mercury in the thermometer shows a rapid increase. Name the radiation X
State the energy conversion taking place in a cathode ray tube
Complete the diagram as given above by drawing the deflection of radioactive radiations in an electric field
Give a scientific explanation.
When the radiation coming out from a certain radioactive substance is passed through an electric field, marks are found at three places on the photographic plate placed in its path.
During the emission of a beta particle, the ______ number remains same.
How is a cathode ray beam affected while passing through a magnetic field?
What do you understand by the term radioactivity?
It is advised not to touch a radioactive substance by hand. Give reason.
Two radioactive sources A and B of half lives of 1 hour and 2 hours, respectively, initially contain the same number of radioactive atoms. At the end of two hours, their rates of disintegration are in the ratio of ______.
In the following atoms, which one is a radioisotope? Give one use of this isotope.
O16, C14, N14, He4
