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Preface : This is an English translation of "The Internet Seminar (Microscopic World -1- Mysteries in the Atomic World)" from the original Japanese version.
The translation was done by myself (the original author) who may not be good at the English language. I hope that somebody proficient in English helps me to improve this English version. Please send your suggestions and proposals for improvement to the following address by e-mail:

I am looking forward to your cooperation.
Thank you very much in advance.
May 15, 2004
Dr. Kenjiro Takada
Emeritus professor of Kyushu University
Contents :
Part 1 : Prologue: Atomic Nature of Matter and Electricity
What is the Microscopic World? The Discovery of Atoms.
The Discovery of Elementary Charge. The Discovery of the Electron.
Part 2 : The Structure of the Atom
The Discovery of Radioactivity. Alpha-Particle Scattering.
Atomic Models. What is an Atomic Nucleus?
Part 3 : The Discovery of the Particle of Light
What is Heat? The Discovery of Energy Quanta.
The Photoelectric Effect. Is Light a Particle?
Part 4 : Electrons and the Wave Nature
What is the True Atomic Structure?
Is an Electron a particle or a Wave? The Particle-Wave Duality.
Epilogue : Opening to Quantum Mechanics
The photograph at the top of this page shows the 10 MV tandem accelerator at Kyushu University. It has the world's highest voltage gradient. The tank dimensions are 4m in diameter and 14m in length.
Huge machines are sometimes needed for investigation of the microscopic world.
Go to Microscopic World -2- (Introduction to Quantum Mechanics).