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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
State three factors on which the rate of emission of electrons from a metal surface depends
How can they be made to leave the metal surface? (State any two ways)
Complete the diagram as given above by drawing the deflection of radioactive radiations in an electric field
What do you mean by Atomic number
What kind of change takes place in a nucleus when a β -particle is emitted?
Define the term radioactivity.
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.
State two characteristics of the substance used as thermionic emitter.
In the following atoms, which one is a radioisotope? Give one use of this isotope.
O16, C14, N14, He4
Assertion (A): Hydrogen atom consists of only one electron but its emission spectrum has may lines.
Reason (R): Only Lyman series is found in the absorption spectrum of hydrogen atom whereas in the emission spectrum, all the series are found.
