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A nucleus of uranium decays at rest into...

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 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.

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The correct Answer is:
B
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