Energy generated by quantum electronic transitions in an atom
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Energy generated by quantum electronic transitions in an atom
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Units for Measuring Waves
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1 sec
Frequency = wavelengths/sec = Hertz
3 cycles per second = 3 hertz
AM and FM Radio frequencies
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• In general means electromagnetic radiation
• The speed of light, c, is a constant:– 2.99792458 x 108meters/second in a vacuum
• A measured number!! We will use 3.00x108 m/s
– 186,000 miles/second in a vacuum.– This is speed NOT frequency!
• The wavelength or frequency of light can be calculated from the formula:
c = wavelength (λ) * frequency (f)
c = λf
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• Energy (E) of a single photon is the product of wavelength (f) and Planck’s constant (h).
E = hf
h = 6.63E-34 J-sec
• Now combine c = λf and E = hf
f = c/λ so E = hc/λ
• We now have three equations in terms of speed, wavelength, frequency and energy that characterize light
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Electromagnetic Spectrum
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Energy In Energy Out
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Electron Transition Producing Light
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Different Quantum Transitions Cause Different Wavelengths of Light
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VISIBLE LIGHT380nm 750nm
Violet
Blue
Green
Orange
Red
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Very Bright Light
Prism
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Continuous white light spectrum
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Bohr’s Model of the Atom
DeBroglie’s Model of the Atom
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END FINI DONE
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S - Orbital
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P – Orbital P-OrbitalDiagram.exe
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D - Orbital
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F - Orbital
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