NEET Physics Kinetic Energy MCQ Question
A neutron in a nuclear reactor moving at a speed of 10^7 m/s must be slowed down to 10^3 m/s to interact effectively with a uranium isotope. What fraction of its initial kinetic energy does the neutron lose after being slowed down to 10^3 m/s?
0.9999
0.1
0.9
0.5
Correct Answer
Detailed Explanation
The initial kinetic energy is proportional to the square of the initial speed (10^7 m/s), and the final kinetic energy is proportional to the square of the final speed (10^3 m/s). By calculating the ratio of final kinetic energy to initial kinetic energy, we find the neutron loses nearly all (99.99%) of its initial kinetic energy.
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