In an alpha -decay, the kinetic energy o...

In an `alpha` -decay, the kinetic energy of `alpha`-particles is `48 MeV` and `Q` value of the reaction is `50 MeV`. The mass number of the mother nucleus is (assume that daughter nucleus is in ground state)

100

104

None of these

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The correct Answer is:

`K_(alpha) = (A-4)/(A) Q rArr 48 = (A-4)/(A) 50 rArr A = 100`

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