c161l19_10_20 - Energy and photons Each photon carries a...

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Energy and photons Energy and photons W Each photon carries a small amount of energy with it W The amount of energy depends on the frequency E = h ν , where h = 6.63×10 -34 J s Low frequency, low energy, high frequency, high energy Can also relate wavelength λ = hc E
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W Total energy = energy per photon × number of photons W E = ne photon = nh ν W Example A cash register scanning laser operates at a wavelength of 655 nm and produces about 3×10 15 photons per second. How much energy does the laser emit each second? mJ m s m Js s photons 9 . 0 10 655 / 10 3 10 63 . 6 / 10 3 9 8 34 15 = × × × × × ×
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High energy Low energy
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Atomic Spectra and Energy Atomic Spectra and Energy Levels Levels W White light contains all frequencies
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W When a voltage is applied to a gas in a sealed container, it emits a light. When this light is passed through a prism, only certain frequencies are found to be present
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W Something, to use the technical term, is moving from one energy level to another and emits a photon. W
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c161l19_10_20 - Energy and photons Each photon carries a...

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