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प्रश्न
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उत्तर
संबंधित प्रश्न
When does the nucleus of an atom tend to become radioactive?
Why is a cathode ray tube evacuated to a low pressure?
Name a gas caused by the Greenhouse effect
What happens to the mass number of an element when (i) an α -particle, (ii) a β -particle, and (iii) γ -radiation is emitted?
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.
Why should a radioactive substance not be touched by hands?
Which part of the atom undergoes a change in the process of radioactive decay?
What is the value of the speed of gamma radiations in air or vacuum?
State three ways of obtaining an electron-beam.
Unit of radioactivity is _______
