The author Dr. B. Siddalingappa, now working as H.O.D. of Physics in Siddaganga Institute of Technology, Tumkur, with 25 years of teaching experience and 3 years of Research experience has so far written 15 books in Kannada Version. He has published his research papers in International Journals and resented in International Conferences. Quantum Mechanics is his first book. The other books are the The Life and Achievements of Scientists and Nobel Prize Awardees, which are published by "Kannada Books Authority", of Government of Karnataka and "Kannada Sahitya Parishat", Bangalore. They are selected as reference books by Karnataka Secondary Education Board and the Directorate of Library, Karnataka Government. This book is a result of the decades of experience of the author in teaching as well as in research in the field of Applied Physics in general and Electronics and Theoretical Physics in Particular.