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Consider the following nuclear decay: (initially \( { }^{236} \mathrm{U}_{92} \) is at rest)
\[
{ }_{92}^{236} \mathrm{U} \longrightarrow{ }_{90}^{232} \mathrm{Th}+\mathrm{X}
\]
If the uranium nucleus is at rest before its decay, which one of the following statement is true concerning the final nuclei ?
(A) They have equal kinetic energies, but the thorium nucleus has much more momentum.
(B) They have equal kinetic energies and momenta of equal magnitudes.
(C) The have momenta of equal magnitudes, but the thorium nucleus has much more kinetic energy.
(D) They have momentum of equal magnitudes, but \( \mathrm{X} \) has much more kinetic energy.
\( \mathrm{P} \)
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