[填空题]
A radioactive nucleus at rest decays into a srsev f 5imp(5) qx3f5 pg7s*4 c0qfbp5f) vyabecond nucleus, pre7opf:cp22 an electron, and a neutrino. The electron and neutrino are emitted at right anglesopp p:c72e2fr and have momenta of $9.30\times10^{-23}kg\cdot m/s$ and $5.40\times10^{-23}\mathrm{~kg}\cdot\mathrm{m/s}$ respectively. What are the magnitude and direction of the momentum of the second (recoiling) nucleus? $ \times10^{-22}$ $^{\circ} $ from the momentum of the electron
