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प्रश्न
What is meant by Radioactivity?
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उत्तर
Process of spontaneous emission of α or β and γ radiations from the nuclei of atoms during their decay.
संबंधित प्रश्न
Why do Free electrons not leave the metal surface on their own
State two similarities and two dissimilarities between the γ-rays and X-rays.
State the penetrating range of α, β and γ radiations.
A radioactive nuclide `""_86^226` Ra decays by emission of two alpha particles, one beta particle and gamma rays. Which of the following is the resulting nuclide X?
What is nucleus of an atom? Compare its size with that of the atom. Name its constitutents. How is the number of these constituents determined by the atomic number its atomic model.
Name two radioactive substances.
State two characteristics of the substance used as thermionic emitter.
From α, β and γ-rays, name the one which is not affected by electric or magnetic field?
A radioctive sample decays `7/8` times its original quantity in 15 minutes. The half-life of the sample is ______.
In the following atoms, which one is a radioisotope? Give one use of this isotope.
O16, C14, N14, He4
