A nucleus moving with a velocity `vec(n)` emits an `prop`-particle . Let the velocity of the `prop`-particle and the remaining nucleus be `vec(n_1) `and `vec(n_2)` and their masses be `m_1` and `m_2` then
Since , no external force is present. So momentum conservation principle is completely applicable
`:.` `m vec(n) = m_1 vec(n_1) + m_2 vec(n_2)`
or `(m_1 + m_2) vec(n) = m_1 vec(n_1) + m_2 vec(n_2)`
Hence , (d) is correct .
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