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3. A stationary atomic nucleus undergoes radioactive decay and a beta particle (a fast- moving electron) and a neutrino (a subatomic particle) are detected leaving the nucleus at high velocities as shown in the following figure. The momentum of the beta particle is 9.2x 1021 kg-m/s [S] and the momentum of the neutrino is 4.9 x 1021 kg-mls [W]. The mass of the remaining nucleus is 3.6 x 1025 kg. v \"is-.- p p = 4.9 x 10'21 (kg )m/s [W] p = 9.2 x 10\"\"(kg )m/s [S] a. What is the recoil velocity of the remaining nucleus? b. If the recoil velocity measured is significantly different from the value calculated in part a, what conclusion might a nuclear physicist reach about the decay