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NEET 2015
Exam
NEET
Year
2015
Subject
Physics
Chapter
Nuclear Physics

NEET 2015 · Physics · Nuclear Physics

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

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

Options

  1. AThe helium nucleus has less momentum then the thorium nucleus
  2. BThe helium nucleus has more momentum than the thorium nucleus
  3. CThe helium nucleus has less kinetic energy than the thorium nucleus
  4. DThe helium nucleus has more kinetic energy than the thorium nucleus

Correct answer

D. The helium nucleus has more kinetic energy than the thorium nucleus

Step-by-step solution

U→Th+αU \to Th + \alpha

KETh=P22mTh,KEα=P22mαK{E}_{Th} = \dfrac{{P}^{2}}{2{m}_{Th}}, K{E}_{\alpha} = \dfrac{{P}^{2}}{2{m}_{\alpha}}

Since mα{m}_{\alpha} is less so KEαK{E}_{\alpha} will be mone.
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