class10 - Class#10 Light The Wave Particle Duality CHEM 107...

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Class #10 Light: The Wave Particle Duality CHEM 107 A. Bengali Texas A&M University Qatar
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Waves ) Characterized by Wavelength, Frequency, Amplitude, Speed
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Waves Wavelength ( λ ) λ
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Waves Amplitude = A here y = A sin(x) A
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Interference + In Phase: Constructive Interference
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Class #12 Interference + Out of Phase: Destructive Interference
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Light as a Wave ) Many wave-like properties: ) Until about 1900 the wave model of light was fully accepted.
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Light is a form of electromagnetic radiation
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Light as a Wave ) Wavelength, frequency, speed related by: c = λ ν ) c fixed (3 x 10 8 m/s) ) λ (or ν ) specifies color of the light ) NOT related to brightness
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Light as a Particle ) In this century, several discoveries have led to a particle model of light. ) Photons : “particles” of light ) Energy of a photon: E = h ν ) h = “Planck’s Constant” = 6.626 x 10 –34 J s ) Since ν = c/ λ , the energy of a photon is also: ) E = hc/ λ
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overall electromagnetic spectrum
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class10 - Class#10 Light The Wave Particle Duality CHEM 107...

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