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Presentation3(sept12) - Chapter 4 Early Quantum Theory 1...

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Chapter 4 : Early Quantum Theory 1. Light – Electromagnetic Radiation 1. Photoelectric Effect 2. Ionization Energy
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Terms and Formulas with Light Photon – a bundle of energy traveling in a wave Wavelength (λ) – distance from crest to crest of the wave Frequency ( ν ) – number of crests passing through a point in a certain time c = λ ν E = h ν = hc/λ
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Electromagnetic Spectrum
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Photoelectric Effect Electrons are ejected from a sample when light hits the sample surface. The light must be above a certain “threshold” frequency ( ν o ). Threshold Frequency ( ν o ): The minimum frequency that provides enough energy to remove an electron. Work function (w): The energy required to remove an electron. w=h ν o The kinetic energy of the emitted electrons is depended on the energy of the light.
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Photoelectric Effect Question The work function of chromium (Cr) is 7.00x10 -19 J. What is the longest wavelength of light that will result in the release of electrons, when shone on chromium?
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