A neutron initially at rest, decays into a proton, an electron and an antineutrino. The ejected electron has a momentum of = 1.4 × 10 –26 kg-m/s and the antineutrino 6.4 ×10 27 kg-m/s. Find the recoil speed of the proton
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Sol. Mass of proton 
be the velocity of proton. Given, moment of electron
and momentum of antineutrino
The electron and the antineutrino are ejected in the same direction.
As the total momentum is conserved the proton should be ejected in the opposite direction.
in the opposite direction.
the electron and ntineutrino are ejected perpendicular to each other.
Total momentum of electron and antineutrino
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