Question:
A nucleus of uranium decays at rest into nuclei of thorium and helium. Then:
A nucleus of uranium decays at rest into nuclei of thorium and helium. Then:
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For equal momentum, lighter particle has more kinetic energy.
Updated On: Mar 24, 2026
- 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
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The Correct Option is D
Solution and Explanation
Step 1: By conservation of momentum, both nuclei have equal momentum.
Step 2: Kinetic energy: \[ K=\frac{p^2}{2m} \]
Step 3: Smaller mass (helium) has larger kinetic energy.
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