Cesium-137 undergoes β- decay, decaying into barium-137. Measurements of the emitted electrons show that the maximum electron energy is 1.176 MeV. If in some β- decay of cesium-137, the emitted electron has a kinetic energy of 0.284 MeV, what is the energy of the emitted neutrino? Consider the mass of cesium-137 to be 127.528 GeV/c2, the mass of barium-137 to be 127.527 GeV/c2, the mass of the electron to be 0.511 MeV/c2, and the neutrino to be massless.
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