Qstnid -I-23-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? - 09: Centre Of Mass, Linear Momentum, Collision

with Solutions - page 2

#23
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?
Ans : In view of the principle of conservation of momentum, the given situation is possible because as a beta particle is ejected, another particle called an antineutrino is also ejected.
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