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Lecture_Notes_101609a

# Lecture_Notes_101609a - -18 J by assuming that electrons...

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Work Function y The threshold frequency to remove an electron from the surface of chromium metal is 1.088 x 10 15 s -1 . Would light with a wavelength of 265 nm be able to remove an electron from the surface of chromium? If yes, what is the velocity of the ejected electron? m e = 9.1094 x 10 -31 kg.

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Heisenberg Uncertainty Principle y Using the Heisenberg uncertainty principle, calculate x for each of the following. y A proton with v = 0.350 m/s. m p = 1.6726 x 10 -27 kg y A bowling ball (mass 7.00 kg) with v = 0.350 m/s.
de Broglie Wavelength y A 0.22 caliber handgun fires a 2.7 g bullet at a velocity of 765 m/s. Calculate the de Broglie wavelength of the bullet.

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Is the wave nature in the bullet on the last slide significant? Y es No t sure 33% 17% 50% 1. Yes 2. No 3. Not sure
Atomic Spectrum of Hydrogen

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Atomic Spectrum of Hydrogen 656nm 486 nm 434 nm 410 nm 365 nm
Fitting the Data of a Line Spectrum y It was possible to fit the line spectrum to a mathematical expression.

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Bohr Model y Bohr was able to calculate the constant -2.178 x 10

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Unformatted text preview: -18 J by assuming that electrons are in orbits. Transitions in Hydrogen n=1 n= 2 n= 3 n= 4 Lyman series Balmer series Emission Absorption Paschen Series Lyman series: UV Balmer series: visible Paschen series: IR Ground state Excited states 0.00 J-21.8 x 10-19 J-4.45 x 10-19 J-2.42 x 10-19 J-1.36 x 10-19 J Energy The Bohr Model Like a Freeway Energy Associated with Electronic Transition y What is the wavelength of light emitted when an electron in a hydrogen atom jumps from the n = 4 state to the n = 2 state? Paradox: The Collapsing Atom y Electrons within the atom cannot be stationary: y If the electrons within the atom move, they will radiate energy: y Why don’t atoms collapse? Standing Waves Electronic Transition in Bohr Model Bohr Model Predictions for Hydrogen y Equation can be used to find the energy difference between levels. y Can be modified for a one electron atom or ion that is not hydrogen....
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Lecture_Notes_101609a - -18 J by assuming that electrons...

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