A nucleus moving with velocity bar(v) em...

A nucleus moving with velocity `bar(v)` emits an `alpha`-particle. Let the velocities of the `alpha`-particle and the remaining nucleus be `bar(v)_(1)` and `bar(v)_(2)` and their masses be `m_(1)` and `(m_2)` then,

A

`vecv , vecv_1 and vecv_2` must be parallel to each other

B

None of the two of `vecv, vecv_1 and vecv_2` should be parallel to each other

C

`vecv_1 + vec_2` must be parallel to `vecv`

D

`m_1 vecv_1 + m_2vecv_2` must be parallel to `vecv`

Verified by Experts

The correct Answer is:

D

Final momentum is in the same direction of initial momentum.

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