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Introductory Physics Homework Help
Determining Planck's Constant [Resolved]
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[QUOTE="Hapablap, post: 4533688, member: 489398"] [B]*Edit: Nevermind, I realize where I went wrong![/B] [h2]Homework Statement [/h2] The following graph shows the kinetic energy of the most energetic photoelectrons as a function of the frequency of light falling on the cathode in a photoelectric cell. [PLAIN]http://img208.imageshack.us/img208/3421/fwby.jpg[/PLAIN] Use the graph to determine the value of Planck's constant. [h2]Homework Equations[/h2] E = hf h = E/f [h2]The Attempt at a Solution[/h2] I'll choose the point where E = 3.0 eV and f = 10.0 Hz for my calculation. First I'll convert eV to Joules: 3.0 eV x (1.60 x 10^-19 J / 1 eV) = 4.8 x 10^-19 J Now the calculation: h = E/f h = (4.8 x 10^-19 J) / (10.0 x 10^14 Hz) h = 4.8 x 10^-34 J(s) We already know that the value of Planck's constant is 6.63 x 10^-34 J(s), so my answer is off. Any suggestions? [/QUOTE]
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Determining Planck's Constant [Resolved]
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