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Unformatted text preview: EEE 539—Fall 2007 Homework 2 2.2 The function V(x,t) = cos(2 π x/ λ−ω t) is also a solution to the classical wave equation. Sketch on the same graph the function V(x,t) as a function of x for 0 ≤ x ≤ λ when: (i) ω t = 0, (ii) ω t = 0.25 π , (iii) ω t = 0.5 π , (iv) ω t = 0.75 π , and (v) ω t = π . 2.5 The work function of a material refers to the minimum energy required to remove an electron from the material. Assume that the work function of gold is 4.90 eV and that of cesium is 1.9 eV. Calculate the maximum wavelength of light for the photoelectric emission of electrons for gold and cesium. The minimum energy is the work function. Then, the wavelength is related to the photon energy by E hc hf hc f c = = = λ . Using this we find the wavelength for gold is 25 . = Au λ micron, The wavelength for cesium is 65 . = Cs λ micron. 2.6 Calculate the de Broglie wavelength, λ = h/p, for: (a) An electron with kinetic energy of (i) 1.0 eV, and (ii) 100 eV. (b) A proton with kinetic energy of 1.0 eV. energy of (i) 1....
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 Spring '08
 Ferry
 Photon, Light, Wavelength, Fundamental physics concepts, ev

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