PhysicsHardHigh School (11–12)Modern Physics › Nuclei and RadioactivityNEETAEEE (Amrita)AMUEEEAP EAPCETBCECECMI Entrance
Created by StemPy LabMatch each emission in List-I with its net effect on the nucleus in List-II. All beta particles are beta minus. List-I (Emission) A. One alpha particle, then two beta particles B. One beta particle C. One gamma ray D. Two alpha particles and two beta particles List-II (Net effect) I. Atomic number lower by , mass number lower by II. Atomic number unchanged, mass number lower by III. Atomic number higher by , mass number unchanged IV. Neither number changes
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← Assertion (A): A nucleus of mass number 238, at rest, emits an alpha particle. The daughter nucleus takes up most of the energy released in the decay. Reason (R): The alpha particle and the daughter nucleus have momenta of equal magnitude, so the lighter of the two has the larger kinetic energy.In a fusion reaction, a deuteron and a triton join to form a helium nucleus and a neutron, and release 17.6 MeV. In a reactor, one nucleus of uranium-235 undergoes fission and releases 200 MeV. Take the mass of a deuteron as 1875.6 MeV/c², the mass of a triton as 2808.9 MeV/c² and the mass of a uranium-235 nucleus as 235 u, with 1 u = 931.5 MeV/c². By what factor is the fraction of the starting mass that is changed into energy larger in the fusion than in the fission? →
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