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Centre of Mass, Linear Momentum, Collision — Physics STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 SciencePhysicsCentre of Mass, Linear Momentum, Collision2 Marks
Question
When a nucleus at rest emits a beta particle, it is found that the velocities of the recoiling nucleus and the beta particle are not along the same straight line. How can this be possible in view of the principle of conservation of momentum?
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Answer

Principle of conservation of momentum is applicable only for macro particles but not for atoms or molecules so principle of conservation of momentum may not be applicable in this case.

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