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Acknowledgment
It is my proud privilege to present this "Physics On-line" site to the world of Physics with all humility and humbleness. In the first place, above all I thank the Almighty who made me an instrument for the benefit of the youth that possess enormous talents and potentials.
My advance thanks to my brothers Mr.P.Joseph Victor Raj, Founder and Managing Trustee, HOPE, Pondicherry-5, India who guided me in technical side in this adventure and Mr.P.A.Vincent Raj, Lecturer, Department of Physics, Petit Seminaire Higher Secondary School, Pondicherry - 1, India who supported me with subjectwise sources.
Gratitude is the most basic value. Hence I sincerely extend my heartfelt thanks to all my colleagues who encouraged and supported with their valuable ideas and suggestions. I gratefully remember my students who have collected numerous data for this work.
I do hope this site will help and enlighten many to make their study precious and meaningful.
P.W.