Q133 / 180 · NEET 2015 (Phase 2) · Physics

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

A
The helium nucleus has less momentum then the thorium nucleus
B
The helium nucleus has more momentum than the thorium nucleus
C
The helium nucleus has less kinetic energy than the thorium nucleus
Correct answer
D
The helium nucleus has more kinetic energy than the thorium nucleus

Solution

U \to T h + α

K E_{T h} = \frac{P^{2}}{2 m_{T h}}, K E_{α} = \frac{P^{2}}{2 m_{α}}

Since

m_{α}

is less so

K E_{α}

will be mone.

Hence, the correct answer is option: 'D'.

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