SampleEx2 - Chem 6 sample exam 2(100 points total This is a...

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Chem 6 sample exam 2 (100 points total) @ This is a closed book exam to which the Honor Principle applies. @ The last 2 pages contain equations, physical constants, and the periodic table. You can detach them for easy reference. @ Please write clearly and SHOW YOUR WORK. If you need to write on the back of the exam paper, please indicate this clearly. @ Some questions are more challenging than others. Allot your time accordingly, and try to answer EVERY question. @ Please put your name on both this page and p. 2. NAME ________________________________________________________
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2 1. (9 pts) Electrons can be ejected from the surface of molybdenum metal by photons of wavelength 274 nm or less. (a) (3 pts) Find the work function ( φ ) of molybdenum (in kJ/mol). (b) (3 pts) Find the maximum kinetic energy (in J) of the electrons ejected from molybdenum by photons having wavelength 100 nm. (c) (3 pts) Find the velocity (in ms –1 ) of the electrons in part (b).
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3 2. (10 points) Show by a calculation using the Heisenberg Uncertainty Principle that an electron cannot be confined within the spherical volume of a nucleus. Assume that the nuclear radius is 1 x 10 –15 m and the potential energy barrier keeping the electron within the nuclear volume is ~ 1.1x10 –12 J.
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4 3. (10 pts) An electron can be removed from an atom using the combined energies of two different photons. In such an experiment, a potassium atom in the gas phase is to be ionized by two different light beams, one of which has wavelength 650 nm. [The first ionization energy for K is 418.8 kJ/mol.] Find the maximum wavelength (in nm) for the second beam that will cause ionization.
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5 4.
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SampleEx2 - Chem 6 sample exam 2(100 points total This is a...

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