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प्रश्न
Define half-life of a radioactive substance
उत्तर
The half-life of a radioactive substance: The time taken by half the number of atoms of the radioactive element, to disintegrate completely, is called half-life period T.
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संबंधित प्रश्न
Is the nucleus formed in the decay of the nucleus `""_11^22Na`, an isotope or isobar?
Consider the fission of `""_92^238"U"` by fast neutrons. In one fission event, no neutrons are emitted and the final end products, after the beta decay of the primary fragments, are `""_58^140"Ce"` and `""_44^99"Ru"`. Calculate Q for this fission process. The relevant atomic and particle masses are
`"m"(""_92^238"U")` = 238.05079 u
`"m"(""_58^140"Ce")` = 139.90543 u
`"m"(""_44^99"Ru")` = 98.90594 u
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Find the binding energy per nucleon of 235U based on the information given below.
| Mass(u) | |
| mass of neutral `""_92^235"U"` | 235.0439 |
| mass of a proton | 1.0073 |
| mass of a neutron | 1.0087 |
