Kennesaw State University Physics 2212

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Presentation transcript:

Kennesaw State University Physics 2212 CH. 35 Light Kennesaw State University Physics 2212

Light Energy of a photon: h = Planck’s constant = 6.63 x 10-34 J.s Light has dual nature (wave/particle)

Light Particle Nature http://www.sciencemag.org/content/338/6114/1576.full (Example) Photoelectric Effect:

Huygens’s Principle “Any wave front can be taken as a series of point sources for the wave propagation”

Other Characteristics of Light Light is quantized like charge Frequency and wavelength can change and relate via equation: Light has speed (“c”) of 3.00 x 108 m/s

Electromagnetic Spectrum

Speed of Light In a vacuum: In a medium: Where n = index of refraction Example: nvacuum=1 nair=1.01

Snell’s Law Snell’s Law of Refraction Equation:

Snell’s Law Critical Angle