Until World War II, the world was familiar with only mechanical, chemical, acoustic, thermal, optic, magnetic and electrical forms of energy. But on a fateful day in 1945 when the U.S. exploded atom bomb over Hiroshima, the world got aware of nuclear energy.
How exactly is energy got from the atom ? The atom is the tiniest speck of matter ? Each atom has a central core called the nucleus, around which revolve the electrons. The
nucleus is built up of two kinds of very minute particles called protons and neutrons. The electron has a negative electrical charge, the proton has an equal positive charge and the neutron has no charge.
The nucleus of the radium atom constantly disintegrates ejecting alpha particles which are nuclei of helium atoms. This phenomenon is called radioactivity. Uranium is another radioactive element. In 1938 Hahn and Strassman bombarded uranium with neutrons and found traces more...