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Unformatted text preview: and c) a free proton having a kinetic energy of 200 eV. 3. (10 points) In a photoelectric eect experiment in which monochromatic light of wave-length, , falls on a potassium surface, it is found the stopping potential is 1 . 91 V for = 3000 A and 0 . 88 V for = 4000 A. For these data, calcu-late: a) Plancks constant using e = 1 . 69 10-19 C, b) the work function, W, for potassium, and c) the threshold frequency, T for potassium....
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- Fall '11