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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
What happens if the negative potential is changed on a grid?
Name the unit in which the work function of a metal is expressed.
Give one example of isobars.
What do you mean by Atomic mass
State the penetrating range of α, β and γ radiations.
What happens to the mass number of an element when (i) an α -particle, (ii) a β -particle, and (iii) γ -radiation is emitted?
Why should a radioactive substance not be touched by hands?
Why are materials of low work function preferred as thermionic cathode materials?
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]
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.
