CBSE-XI-Physics
46: The Nucleus
- #9When a boron nucleus
(B510)is bombarded by a neutron, a α-particle is emitted. Which nucleus will be formed as a result?Ans : It is given that when a boron nucleus `` \left({}_{5}{}^{10}\,\mathrm{\,B\,}\right)`` is bombarded by a neutron, an α-particle is emitted.
Let X nucleus be formed as a result of the bombardment.
According to the charge and mass conservation,
`` {}_{5}{}^{10}B+{}_{0}{}^{1}n\to X+{}_{2}{}^{4}He``
`` \,\mathrm{\,Charge\,}:50\overline{)3}2``
`` \,\mathrm{\,Mass\,}:101\overline{)7}4``
`` ``
The mass number of X should be 7 and its atomic number should be 3.
`` \therefore X={}_{3}{}^{7}Li``
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