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Introduction to Modern Physics [UNIT IV. ATOMIC SPECTRA]
The standard undergraduate programme in physics of all Indian Universities includes courses on
Special Theory of Relativity, Quantum Mechanics, Statistical Mechanics, Atomic and Molecular
Spectroscopy, Solid State Physics, Semiconductor Physics and Nuclear Physics. To provide study material
on such diverse topics is obviously a difficult task partly because of the huge amount of material and
partly because of the different nature of concepts used in these branches of physics. This book comprises
of self-contained study materials on Special Theory of Relativity, Quantum Mechanics, Statistical
Mechanics, Atomic and Molecular Spectroscopy. In this book the author has made a modest attempt to
provide standard material to undergraduate students at one place. The author realizes that the way he
has presented and explained the subject matter is not the only way; possibilities of better presentation
and the way of better explanation of intrigue concepts are always there. The author has been very
careful in selecting the topics, laying their sequence and the style of presentation so that student may
not be afraid of learning new concepts. Realizing the mental state of undergraduate students, every
attempt has been made to present the material in most elementary and digestible form. The author feels
that he cannot guess as to how far he has come up in his endeavour and to the expectations of
esteemed readers. They have to judge his work critically and pass their constructive criticism either to
him or to the publishers so that they can be incorporated in further editions. To err is human. The
author will be glad to receive comments on conceptual mistakes and misinterpretation if any that have
escaped his attention.
A sufficiently large number of solved examples have been added at appropriate places to make the
readers feel confident in applying the basic principles.
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