Chapter 2

Wave-particle Duality

The opposite of a profound truth may well be another profound truth.

—Niels Bohr

2.1   INTRODUCTION

In this chapter we shall discuss, in brief, various experiments which have been performed to investigate the nature of microscopic objects like electrons, neutrons, and electromagnetic radiations. There are experiments, such as Young’s two-slit experiment and X-ray diffraction experiment, which suggest that electromagnetic radiations propagate in the form of waves. On the other hand, there are experiments, such as photoelectric effect and Compton scattering, which suggest that electromagnetic radiations consist of particles in the form of quanta of energy having well-defined linear momentum, well-defined energy, ...

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