AP Physics 2
15.7 Fission, Fusion, and Nuclear Decay
A stationary uranium-235 nucleus captures a single slow neutron of negligible kinetic energy, causing it to undergo fission according to the reaction below, where \(x\) represents the number of emitted neutrons:
\[ {}^{1}_{0}\text{n} + {}^{235}_{92}\text{U} \rightarrow {}^{141}_{56}\text{Ba} + {}^{92}_{36}\text{Kr} + x \, {}^{1}_{0}\text{n} \]
The rest masses of a neutron, a uranium-235 nucleus, a barium-141 nucleus, and a krypton-92 nucleus are \(m_{\text{n}}\), \(m_{\text{U}}\), \(m_{\text{Ba}}\), and \(m_{\text{Kr}}\), respectively. In terms of the given quantities and the speed of light \(c\), which of the following expressions represents the total kinetic energy released in this fission event?
\[ {}^{1}_{0}\text{n} + {}^{235}_{92}\text{U} \rightarrow {}^{141}_{56}\text{Ba} + {}^{92}_{36}\text{Kr} + x \, {}^{1}_{0}\text{n} \]
The rest masses of a neutron, a uranium-235 nucleus, a barium-141 nucleus, and a krypton-92 nucleus are \(m_{\text{n}}\), \(m_{\text{U}}\), \(m_{\text{Ba}}\), and \(m_{\text{Kr}}\), respectively. In terms of the given quantities and the speed of light \(c\), which of the following expressions represents the total kinetic energy released in this fission event?
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