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A nucleus of uranium decays at rest into nuclei of thorium and helium. Then:
A
The helium nucleus has less kinetic energy than the thorium nucleus
B
The helium nucleus has more kinetic energy than the thorium nucleus
C
The helium nucleus has less momentum than the thorium nucleus
D
The helium nucleus has more momentum than the thorium nucleus
Detailed Solution
By conservation of linear momentum: $p_{He} = p_{Th}$ in magnitude.
$K = \frac{p^2}{2m} \propto \frac{1}{m}$, and $m_{He} K_{Th}$.
$K = \frac{p^2}{2m} \propto \frac{1}{m}$, and $m_{He} K_{Th}$.