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07Ex1ch261 - CHEM 261 FINAL EXAM CHEM 260 FIRST EXAM Friday...

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CHEM 261 - FINAL EXAM; CHEM 260 - FIRST EXAM Friday, May 18, 2007 PRINT NAME_______________________ ________________________ first last “The contributions of the two men are independent of each other and so significant that it would not be appropriate to divide the prize between them. The question of who should receive the prize first is difficult to decide. I personally value Schrodinger’s contribution higher because I have the impression that the concepts created by him will extend further than those of Heisenberg. If I had the decision, I would give Schrodinger the prize first…. But that’s only my opinion” From Albert Einstein’s nomination of Erwin Schrodinger for the 1932 Nobel Prize in physics. The Swedish Academy didn’t listen to Einstein and gave the first Nobel Prize for quantum mechanics to Heisenberg. TABLE I USEFUL INFORMATION k B = Boltzmann's constant = 1.38 x 10 -23 J/K h = Planck's constant = 6.6 x 10 -34 Jsec R H = Rydeberg Constant = 2.18 x 10 -18 J C = velocity of light = 3 x 10 8 m/sec m e = the mass of the electron = 9.1 x 10 -31 kg Heisenberg Uncertainty Principle *Question I (10%) Question Score I II III IV V VI VII VIII IX Total 1
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A. One thousand (1000) atoms at 500K are distributed among five energy states whose energies are listed in Table II below. How many atoms are in each state? SHOW ALL WORK ! TABLE II State Energy (joules/atom) 1 0 2 6.9 x 10 -21 3 1.38 x 10 -20 4 1.38 x 10 -20 5 2.07 x 10 -20 B. Calculate the total energy, E, for the system. SHOW ALL WORK Multiple Choice (10%). Circle the letter corresponding to the best answer to each of the following questions. *1. Of the following, the electromagnetic radiation with the most energy is: 2
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a. radio waves b. Infrared rays c. X-rays d. ultra violet light e. visible light *2. The German physicist who first realized that there was something wrong with classical physics' description of the universe, and who issued the challenge to the physics community to investigate black body radiation, which lead directly to quantum theory, was: a. Ludwig Boltzmann b. Max Planck c. Albert Einstein d. Max Born e. Gustav Kirchoff *3. According to quantum mechanics, before the box is opened, Schrodinger's cat's wave function, ψ, implies that the cat: a. is dead b. is alive c. has a 0.5 chance of being dead d. has a 0.5 chance of being alive e. is simultaneously dead and alive f. is not in the box at all because she didn't like the experiment one little bit.
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