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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
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?
Define free electrons.
What are the types of emission?
What are cathode rays? Why are they called ‘cathode rays’? Name a material which exhibits fluorescence when cathode rays fall on it.
Why are materials of low work function preferred as thermionic cathode materials?
In a cathode ray tube state the purpose of covering cathode by thorium and carbon.
From α, β and γ-rays, name the one which is not affected by electric or magnetic field?
Assertion (A): The force of repulsion between atomic nucleus and α-particle varies with distance according to inverse square law.
Reason (R): Rutherford did α-particles scattering experiment.
