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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
Complete the diagram as given above by drawing the deflection of radioactive radiations in an electric field
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 ?
What happens to the mass number of an element when (i) an α -particle, (ii) a β -particle, and (iii) γ -radiation is emitted?
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.
An element P disintegrates by α - -emission and the new element suffers two further disintegrations, both by β -emission, to form an element Q. Explain the fact that P and Q are the isotopes.
How is a cathode ray beam affected while passing through an electric field?
The activity of a certain radionuclide decreases to 15 percent of its original value in 10 days. What is its half life?
[ln (0.15) = -1.9]
A radioactive element is placed in an evacuated chamber. Then the rate of radioactive decay will ______.
A deuteron strikes 8O16 nucleus with subsequent emission of an alpha particle. Identify the nucleus so produced:
