Chem 141 2009_Prob Set 8

Chem 141 2009_Prob Set 8 - CHEM 141 Problem Set 8(60 pts...

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CHEM 141: Problem Set 8 (60 pts) Due by noon Wednesday, Nov 18, 2009 1) (8 pts) Hot objects can emit blackbody radiation that appears red, orange, white, or bluish-white, but never green. Provide a rationalization. 2) (8 pts) Vast clouds of luminous hydrogen gas have been found in interstellar space. Spectroscopic evidence suggests that the atoms are very hot and atoms in excited states with n 100 are not uncommon. a) What wavelength of light would be detected if some of the atoms decayed from the n = 100 level to the n = 2 level? b) To which spectroscopic series of the hydrogen atom would this transition be assigned? c) Would a transition from n = 110 to n = 100 occur at a longer or a shorter wavelength than those found for the Balmer series? 3) (8 pts) Gilbert, Kirss, Foster, and Davies, chapter 7, exercise 7.54, pg. 351. 4) (6 pts) The velocity of the electron in the Bohr model of the atom was given in terms of known constants, the nuclear charge Z , and the quantum number n on pg 146 of the lecture handouts. Calculate the velocities of the
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