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quantum theory of light - WaveParticle Duality of Light...

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Wave-Particle Duality of Light Quantum theory  tells us that both light and matter consists of tiny particles which have  wavelike  properties  associated with them.  Light  is composed of particles called photons, and  matter  is composed of  particles called electrons, protons, neutrons. It's only when the mass of a particle gets small enough that its  wavelike properties show up. To help understand all this let's look at how light behaves as a wave and as a particle. Wave-like Behavior of Light One behavior of waves is  Diffraction
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Another behavior of waves is Interference
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Although I said that light is composed of particles called photons, one can easily show that light can be thought  of as an electromagnetic wave that travels at the speed of light. The frequency of light is related to its  wavelength according to Let's look at an example calculation. The light blue glow given off by mercury street lamps has a wavelength of   λ   = 436nm. What is its frequency?
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