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Unformatted text preview: Chapter 27 Additional Problems Q1. When light of wavelength 350 nm falls on a potassium surface, electrons are emitted that have a maximum kinetic energy of 1.31 eV. Find (a) the work function of potassium, (b) the cutoff wavelength, and (c) the frequency corresponding to the cutoff wavelength. Ans: (a) From the photoelectric effect equation, the work function is max hc KE , or 34 8 19 9 6.63 10 J s 3.00 10 m s 1 eV 1.31 eV 350 10 m 1.60 10 J 2.24 eV (b) 34 8 19 6.63 10 J s 3.00 10 m s 1 eV 2.24 eV 1.60 10 J c hc 555 nm (c) 8 9 3.00 10 m s 555 10 m c c c f 14 5.41 10 H z Q2. Lithium, beryllium, and mercury have work functions of 2.30 eV, 3.90 eV, and 4.50 eV, respectively. If 400nm light is incident on each of these metals, determine (a) which metals exhibit the photoelectric effect and (b) the maximum...
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This note was uploaded on 08/25/2009 for the course PHY 213 taught by Professor Cao during the Summer '08 term at Kentucky.
 Summer '08
 Cao
 Physics, Energy, Kinetic Energy, Work, Light

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