A neutron is an electrically neutral subatomic particle

Chapter 11, Problem 11.105

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A neutron is an electrically neutral subatomic particle with a mass just slightly greater than that of a proton. A free neutron is radioactive and decays after a few minutes into other subatomic particles. In one experiment, a neutron at rest was observed to decay into a proton 1mass 1.67 * 10-27 kg2 and an electron 1mass 9.11 * 10-31 kg2. The proton and electron were shot out back-to-back. The proton speed was measured to be 1.0 *105 m/s and the electron speed was 3.0 * 107 m/s. No other decay products were detected. a. Did momentum seem to be conserved in the decay of this neutron?

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