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प्रश्न
What do you mean by Mass number.
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उत्तर
Mass number is the sum of protons and neutrons present in the nucleus.
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संबंधित प्रश्न
What are free electrons?
How can they be made to leave the metal surface? (State any two ways)
In a cathode ray tube state:
(i) the purpose of covering cathode by thorium and carbon.
(ii) the purpose of the fluorescent screen.
(iii) how is it possible to increase the rate of emission of electrons.
What happens to the mass number of an element when (i) an α -particle, (ii) a β -particle, and (iii) γ -radiation is emitted?
Name two radioactive substances.
State two properties that a substance should possess when used as a thermionic emitter.
Mention four properties of Becquerel rays.
The half-life of a radioactive nuclide is 100 hours. The fraction of original activity that will remain after 150 hours would be ______.
