Test Index

BITSAT 2014 Paper

Section: Physics

Question : 37 of 150

Marks: +1, -0

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

the helium nucleus has less momentum than the thorium nucleus
the helium nucleus has more momentum than the thorium nucleus
the helium nucleus has less kinetic energy than the thorium nucleus
the helium nucleus has more kinetic energy than the thorium nucleus

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_{h}

\frac{P^2}{2 m_{Th}}

KE_{He}

\frac{P^2}{2 m_{He}}

since

m_{He}

is less so

KE_{He}

will be more

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