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Q1/ ANucleuus , original , at rest , decays radioactivity by emitting an electron of momentum 1.73Mev/c , and at right angles to the direction of the electron aneutrino with momentum 1.0 Mev/c . in what direction dose the Nucleus recoil ? what is momentum in Mev/c ? if the mass of the residual nucleus 3.90 * 10-25 kg what is its kinematic energy in electron volt .