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Practice Exam

# Practice Exam - Sample Questions Final Fall 2010 1...

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Sample Questions Final Fall 2010 1. Calculate the frequency of visible light having a wavelength of 486.1 nm. A. 2.06 × 10 14 /s B. 2.06 × 10 6 /s C. 6.17 × 10 14 /s D. 1.20 × 10 –15 /s E. 4.86 × 10 –7 /s 2. A beam of neutrons (mneutron = 1.6749 x 10 -24 g) has a velocity of 1.44 km/hour. What is the wavelength of the neutron wave? 3. When light of a wavelength of 125 nm strikes a certain metal, electrons having a velocity of 8.2 x 10 5 m/s are emitted from the surface of the metal. What is the threshold frequency of the metal? 4. What are the possible values for the orbital angular momentum quantum number l given the following values for the other three quantum numbers: n = 4, l = ?, ml = 0, ms = +1/2 Page 1

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Sample Questions Final Fall 2010 5. If the wavelength of an electron is equal to the radius of the n=2 orbit in He + , what must the velocity of the electron be? A. 6.88 x 10 6 m/s B. 1.38 x 10 7 m/s C. 3.44 x 10 6 m/s D. 5.47 x 10 5 m/s E. The velocity cannot have an exact value 6. Davisson and Germer (as well as G. P. Thompson) conducted a famous and important experiment. Which of the following statements is TRUE concerning their experiment? 7. Which of the following statements is/are TRUE ?
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Practice Exam - Sample Questions Final Fall 2010 1...

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