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प्रश्न
When does the nucleus of an atom tend to become radioactive?
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उत्तर
When the number of neutrons exceeds much than the number of protons in a nuclei, it become unstable or radioactive.
संबंधित प्रश्न
Name the radiations which are absorbed by greenhouse gases in the earth’s atmosphere.
State the energy conversion taking place in a cathode ray tube
Define the term radioactivity.
Radioactive substances were found to give off three types of rays. Name them. How do they
(a) React to the magnetic field?
(b) React to the electric field?
(c) Act when different thickness of lead sheets is placed in their path?
A certain nucleus A (mass number 238 and atomic number 92) is radioactive and becomes a nucleus B (mass number 234 and atomic number 90) by the loss of one particle.
What particle was emitted?
Name a common device where a hot cathode ray tube is used.
It is advised not to touch a radioactive substance by hand. Give reason.
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 ______.
