Quantum mechanics is a theory developed to explain inconsistencies of classical mechanics when dealing with very small objects. Its fundamental idea is that energy is not a continuous quantity but comes in small packets ("quanta") of uniform size. Classical mechanics is fully contained in quantum mechanics as its limit for objects of larger than atomic size. However, quantum mechanics has implications for phenomena at much larger scales, e.g. energy bands in solids. Quantum-mechanical properties are the basis of techniques such as magnetic resonance imaging and scanning tunnelling microscopy.

Building on the Year 1 models "The Quantum Universe" this Year 2 20 credit module develops the Quantum Physics of the microscopic world.The mathematical equivalence and physical distinction between the Wave Equation and Schrondinger'r Equation are emphasised at the macroscopic and quantum level. Photons, electrons and neutrons are described and the consequences of the Uncertainty Principle emphasised. Quantisation, scattering and tunneling phenomena are covered in the context of the particle in a well and the simple harmonic oscillator. The quantum solution of the hydrogen atom is given and the concept of spin is extended to the understanding of magnetic properties. Throughout the module illustrative numerical problems are given relating to quantum mechanics and wave-particles