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Explanation: Electron has the least mass among the given particles, approximately 1/1836 of a proton.
Explanation: The Sun’s energy comes from the fusion of hydrogen nuclei into helium, releasing enormous energy.
Explanation: Uranium-235 undergoes controlled fission in nuclear power plants to produce electricity.
Explanation: Radioactivity is the spontaneous disintegration of unstable atomic nuclei with emission of radiation.
Explanation: Henri Becquerel discovered natural radioactivity in 1896 while studying uranium salts.
Explanation: Beta particles have small mass and high velocity, so they are deflected most in a magnetic field.
Explanation: Americium-241 emits alpha particles that ionize air, helping detect smoke in alarm systems.
Explanation: Alpha particles can be stopped by a sheet of paper or even human skin.
Explanation: Each uranium-235 fission releases about 200 MeV of energy in the form of kinetic energy and radiation.
Explanation: Pressurized water reactors use light water as both coolant and moderator.
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