By A.P. French

ISBN-10:

ISBN-13: 0971497272839

ISBN-10: 0393091066

ISBN-13: 9780393091069

An creation to Quantum Physics. The M.I.T. Introductory Physics sequence

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Extra resources for An Introduction to Quantum Physics. The M.I.T. Introductory Physics Series

Sample text

T'hus it will often he convenient to rewrite 1;q. 602 x 10 12 erg It is also standard practice to express the wavelengths A of atomic spectra in angstroms. It is therefore convenient to express the quantities h and hr in corresponding units. 136 x 10 '5 CV-sec he = 12,400 e V- (1-11) 0A We can then rewrite Eq. 0 eV, indicating the appropriateness of the electron volt as an energy unit for photons in the visible region. When Einstein first introduced the photon concept, he had very limited evidence with which to support it.

163 if. tions of Modern Ph 26 Simple models of the atom e2 a° (1-23a) 2hcR H Using the experimentally determined value for RH, the atomic radius of hydrogen in its lowest energy state can be calculated. We shall calculate ao below in terms of fundamental physical constants. Thus, beginning with Bohr's postulates, a classical analysis buttressed by Balmer's empirically derived formula leads to values for the energies of stationary states in the hydrogen atom and for the radius of hydrogen in its lowest or ground state.

Thomson worked hard on detailed models for atoms con- taining several electrons, but with very limited success. His main achievement was to discover various stable (static) arrangements of electrons within the positive charge cloud, but the problem of spectra was essentially intractable on this basis. ) Before turning to the next atomic model the totally different one proposed by Niels Bohr after Rutherford's discovery of the atomic nucleus we shall give a brief description of some simple spectra that this new model was able to interpret in a remarkably successful way.

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An Introduction to Quantum Physics. The M.I.T. Introductory Physics Series by A.P. French


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