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Atoms and Nuclei question

2015 · Q127
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Atoms and Nuclei question

2015 · Q127

NEETPhysicsAtoms and NucleiMCQ+4 / −1
A nucleus of uranium decays at rest into nuclei of thorium and helium. Then
  1. A
    The helium nucleus has more momentum than the thorium nucleus.
  2. B
    The helium nucleus has less kinetic energy than the thorium nucleus.
  3. C
    The helium nucleus has more kinetic energy than the thorium nucleus.
  4. D
    The helium nucleus has less momentum than the thorium nucleus.
View written solutionFree

Correct answer: C

In an explosion a body breaks up into two pieces of unequal masses both part will have numerically equal momentum and lighter part will have more velocity.

U →\to→ Th + He

KETh = P22mTh{{{P^2}} \over {2{m_{Th}}}}2mTh​P2​

KEHe = P22mHe{{{P^2}} \over {2{m_{He}}}}2mHe​P2​

since mHe is less so KEHe will be more.

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