A nucleus of uranium decays at rest into...

A nucleus of uranium decays at rest into nuclei of thorium and helium . Then:

The helium nucleus has less kinetic energy than the thorium nucleus

The helium has more kinetic energy than the thorium nucleus

The helium nucleus has less momentum than' the thorium nucleus

The helium nucleus has more momentum than the thorium nucleus

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In a fusion reactor, the reaction occurs in two stages. (i) Two deuterium (""_(1)^(2)D) nuclei fuse to form a tritium (""_(1)^(3)T) nucleus with a proton as product. (ii) A tritium nucleus fuses with another deuterium nucleus to form a helium (""_(2)^(4)He) nucleus with neutron as another product. Find (a) the energy released in each stage. (b) the energy released in the combined reaction per deuterium and (c) what percentage of the mass energy of the initial deuterium is released? Given : ""_(1)^(2)D=2.014102u,""_(1)^(3)T=3.016049u,""_(2)^(4)He=4.002603u,""_(1)^(1)H=1.007825u,""_(0)^(1)n=1.008665u Take 1u = 931 MeV

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