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Unformatted text preview: CHEM1101: CHEMISTRY (EEE/COE) LECTURE 2 WAVE MECHANICAL CONCEPT OF THE ATOM Dual Nature of Matter In Bohr atomic model, we see the electron as particle. But in modern wave mechanical concept described by Louis de Broglie in 1924, electron has both wave and particle nature which is known as dual nature of matter. Louis de Broglie (1892-1987) who was working on his Ph.D. degree at the time, made a daring hypothesis: “if radiant energy could, under appropriate circumstances behave as though it were a stream of particles, then could matter, under appropriate circumstances, exhibit wave-like properties?” The dual character- wave and particle may not be confined to radiation alone but extended to matter as well which is called ‘Wave mechanical Theory’. Hence Bohr concept has been superseded completely by the modern wave mechanical concept. Heisenberg’s Uncertainty Principle: For a relatively large solid object, like a bowling ball, we can determine its position and velocity at any given moment with a high degree of accuracy. However, if an object (like an electron) has wave-like properties then how can we accurately define its' position? Werner Heisenberg (1901-1976) concluded (in 1927) that due to the dual nature of matter (both particle and wavelike properties) it is impossible to simultaneously know both the position and momentum (mass-velocity) of an object as small as an electron. The position and momentum of a moving particle are interdependent and cannot be measured with absolute exactness. If momentum is measured accurately, the position becomes less precise; if the position is determined accurately, the momentum becomes uncertain or less accurate....
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This note was uploaded on 04/16/2011 for the course EEE 30 taught by Professor Dr.sohrabuddin during the Spring '11 term at American Intl. University.
- Spring '11