9. Proton, electron, neutron, and alpha particles have the same momentum. Which of them has the highest kinetic energy (KE)?(Work, Power & Energy, law of conservation of energy)
Correct answer: B. Electron
- A. Proton
- B. Electron
- C. Neutron
- D. Alpha particle
Explanation
Explanation: Kinetic energy (KE) is given by KE = 1/2 mv², where m is mass and v is velocity. Since all particles have the same momentum (p = mv), the one with the smallest mass (electron) will have the highest velocity and therefore the highest KE.Incorrect Options:(a) While protons are heavier than electrons, they also have lower velocities due to the same momentum. This leads to lower KE compared to electrons.(c) Similar to protons, neutrons have higher mass but lower velocities, resulting in lower KE than electrons.(d) Alpha particles are much heavier than electrons, but their lower velocities due to the equal momentum translate to lower KE compared to electrons.
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About Work and Energy
Work transfers energy when a force causes displacement, while kinetic energy, gravitational potential energy and power describe motion, position and the rate of energy transfer. The work-energy theorem links net work with change in kinetic energy, and efficiency accounts for energy losses rather than treating them as energy destruction.
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