02 Notes - Nature of Light

02 Notes - Nature of Light - Continuous vs. Quantized E = h...

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Pluchino – Regents Chemistry Atomic History & Electron Configuration – 02 Nature of Light Aim: Is light a particle or a wave? Do Now: Make a list of all the facts you know about light. Electromagnetic Spectrum Behavior of Light Generally, light travels in a wave form: c =   Speed (c): light travels at 3.00x10 8 m/s Wavelength ( ): distance from crest to crest (nm) Frequency( ): how fast a wave oscillates up and down (hertz) When white light is passed through a spectrum all the colors are observed: When elements are excited in the gaseous phase, only certain colors are observed.
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Pluchino – Regents Chemistry Max Planck: Energy is quantized ! There is a specific amount of energy that can be absorbed or released by an electron.
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Unformatted text preview: Continuous vs. Quantized E = h h = 6.63x10-34 Js (Plancks Constant) How much energy, in Joules, is present in red light (700 nm)? Light can behave as tiny particles of energy, known as photons Photoelectric Effect: when light at specific wavelengths are shined on a metal surface, energy is ejected. At other wavelengths no electrons will be ejected. Light can act as both a particle and a wave! It depends on the situation Conclusions: Light generally behaves as a wave Light is governed by two equations: o c = o E = h Energy is quantized - Max Planck The photoelectric effect demonstrates the particle-like properties of light Light can be both a particle and a wave...
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This note was uploaded on 01/01/2012 for the course CHEM 101 taught by Professor Donahue during the Spring '11 term at Long Island U..

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02 Notes - Nature of Light - Continuous vs. Quantized E = h...

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