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BITSAT2014PhysicsNuclear PhysicsActual

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

Options

  1. Athe helium nucleus has less momentum than 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

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 Th + He KE _ Th = P ² 2 ~m _ Th , KE _ He = P ² 2 ~m _ He sinc m _ He is less so KE _ He will be more.

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