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TApract - CH301 Fall 2010 Practice Exam1TA Style 1 The...

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CH301 Fall 2010 Practice Exam1—TA Style 1. The signal from a radio station has a wavelength of 0.60 km. What is the frequency of a photon with this wavelength? 1. 5 × 10 10 Hz 2. 3.3 × 10 −25 Hz 3. 5 × 10 8 Hz 4. 3.3 × 10 −22 Hz 5. 5 × 10 5 Hz 2. Classically the energy contained in electromagnetic radiation is proportional to the (amplitude, frequency, wavelength), whereas in quantum mechanics it is proportional to the (amplitude, frequency, wavelength). 1. amplitude; wavelength 2. frequency; wavelength 3. wavelength; amplitude 4. wavelength; frequency 5. amplitude; frequency 3. In a hydrogen atom which electronic transition would emit the longest wavelength of light? 1. n = 2 to n = 4 2. n = 5 to n = 4 3. n = 4 to n = 3 4. n = 2 to n = 1 5. n = 5 to n = 3 6. n = 1 to n = 2 4. In a one-dimensional particle in a box, the zero-point energy corresponds to. .. 1. a node. 2. n = 1. 3. a quantum state where the Uncertainty Principle is not valid. 4. n = 0. 5. Ψ 2 = 0. 5. Find the minimum uncertainty in the position of a cannon ball with a mass of 50,000 g with an uncertainty in velocity of 100 m·s −1 . (approximating should get you the right answer) 1. 1.05 × 10 −38 m 2. 1.05 × 10 −41 m 3. 2.10 × 10 −38 m 4. There is not enough information. 5. 4.52 × 10 −38 m 6. The average speed of a helium atom at 25 °C is 1.23 × 10 3 m·s −1 . What is the average wavelength of a helium atom at this temperature? (trickier than 5, but still doable without a calculator) 1. 4.15 × 10 −12 m 2. 2.03 × 10 −11 m 3. 7.43 × 10 −15 m 4. 8.11 × 10 −11 m 5. 4.06 × 10 −11 m 7. Which of the following applications of the Schrodinger equation includes a potential energy term with both attractive and repulsive terms?
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1. V ( r ) for the electron in the hydrogen atom 2. V ( x ) for the standing wave of a plucked guitar string
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