Chapter 27 Additional Example Problems

Chapter 27 Additional Example Problems - Chapter 27...

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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 400-nm 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.

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Chapter 27 Additional Example Problems - Chapter 27...

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