Q. A neutron , an electron, a proton and an alpha particle are moving with the same kinetic energy. Which of the following is correct order of their speeds?
Answer: Alpha Particle, Neutron, Proton, Electron
Notes: The correct order of speeds for particles with the same kinetic energy is: Electron, Proton, Neutron, Alpha Particle. Kinetic energy (KE) is given by the formula ( KE = frac{1}{2} mv^2 ). For a given KE, speed ( v ) is inversely proportional to the square root of mass ( m ). Electrons are the lightest, followed by protons, neutrons, and then alpha particles (which are composed of two protons and two neutrons). Thus, the lighter the particle, the higher its speed for the same kinetic energy. Trivia: An alpha particle has a mass approximately four times that of a proton, making it the heaviest among the listed particles.