Max Planck, a German scientist, proposed that atoms could only give out energy in fixed units called quanta.
Quanta are packets of energy that exist in lumps or units –but when they travel, they spread out like waves on the surface of a pond. This theory has been developed to explain the behavior of particles, and the energy they emit.
Planck’s quantum theory shows that energy behaves as both waves and particles at the same time. Planck also discovered a universal constant known as planck’s constant.
Planck’s constant and the quantum theory represented the birth of a new field of physics known as quantum mechanics, which, in turn, laid the foundation for nuclear research.