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HW13-solutions

# HW13-solutions - Munoz(gm7794 HW13 TSOI(92515 This...

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Munoz (gm7794) – HW13 – TSOI – (92515) 1 This print-out should have 12 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 (part 1 of 2) 10.0 points A hypothetical atom has four energy states as shown. 0 - 1 - 2 - 3 - 4 - 5 - 6 - 7 - 8 n = 4 n = 3 n = 2 n = 1 Energy (eV) Which of the following photon energies E ν could NOT be found in the emission spectra of this atom after it has been excited to the n = 4 state? 1. E ν = 2 eV 2. E ν = 1 eV 3. E ν = 4 eV correct 4. E ν = 5 eV 5. E ν = 3 eV Explanation: By subtraction, the transition from n = 4 to n = 3 would release 1 eV; from n = 4 to n = 2 would release 3 eV; from n = 3 to n = 2 would release 2 eV; from n = 3 to n = 1 would release 5 eV. The only choice remaining is 4 eV . 002 (part 2 of 2) 10.0 points Which of the following transitions will pro- duce the photon with the longest wavelength? 1. n = 4 to n = 3 correct 2. n = 3 to n = 2 3. n = 3 to n = 1 4. n = 4 to n = 1 5. n = 2 to n = 1 Explanation: The longest wavelength is produced in the case where the least amount of energy is released. That is, in this case, from n = 4 to n = 3 . 003 10.0 points In an experiment, light of a particular wave- length is incident on a metal surface, and electrons are emitted from the surface as a result. To produce more electrons per unit time but with less kinetic energy per electron, the experimenter should do which of the follow- ing? 1. Decrease the intensity and increase the wavelength of the light 2. Decrease the intensity and the wavelength of the light 3. Increase the intensity and the wavelength of the light correct 4. Increase the intensity and decrease the wavelength of the light 5. None of these would produce the desired result.

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