Physics307L:People/Phillips/Photoelectric: Difference between revisions
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<math>h^{1}_{first order} = (6.911 \pm .087) \times 10^{-34}~\mathrm{J}\cdot\mathrm{s} = (4.319 \pm .054) \times 10^{-15}~\mathrm{eV}\cdot\mathrm{s}</math> | <math>h^{1}_{first order} = (6.911 \pm .087) \times 10^{-34}~\mathrm{J}\cdot\mathrm{s} = (4.319 \pm .054) \times 10^{-15}~\mathrm{eV}\cdot\mathrm{s}</math> | ||
<math>h^{2}_{first order} = (6.978 \pm .059) \times 10^{-34}~\mathrm{J}\cdot\mathrm{s} = (4.361 \pm .037) \times 10^{-15}~\mathrm{eV}\cdot\mathrm{s}</math> | |||
each with percent errors from the accepted value of | |||
<math>\% error^{1}_{first order} = 4.30\%</math> | |||
<math>\% error^{2}_{first order} = 5.32\%</math> | |||
Along with these first order values, we also ran through the experiment using only the second order maxima, obtaining different values for Planck's constant: | |||
Revision as of 17:29, 6 December 2008
Photoelectric Effect (Planck's Constant) Summary
Data & Results
The notebook entry for this lab is located here. We generated two Excel files for this lab as well: Planck.xlsx and First Order.xlsx.
We measured two different things in this lab related to the photoelectric effect, but only one of these has an accepted value - Planck's Constant. This value is
[math]\displaystyle{ h_{acc} = 6.626\,068\,96(33) \times 10^{-34}~\mathrm{J}\cdot\mathrm{s} = 4.135\,667\,33(10) \times 10^{-15}~\mathrm{eV}\cdot\mathrm{s} }[/math]
We came up with many different value for Planck's constant. We obtained two from the first order maxima from the light source, each being a separate run through the colors:
[math]\displaystyle{ h^{1}_{first order} = (6.911 \pm .087) \times 10^{-34}~\mathrm{J}\cdot\mathrm{s} = (4.319 \pm .054) \times 10^{-15}~\mathrm{eV}\cdot\mathrm{s} }[/math]
[math]\displaystyle{ h^{2}_{first order} = (6.978 \pm .059) \times 10^{-34}~\mathrm{J}\cdot\mathrm{s} = (4.361 \pm .037) \times 10^{-15}~\mathrm{eV}\cdot\mathrm{s} }[/math]
each with percent errors from the accepted value of
[math]\displaystyle{ \% error^{1}_{first order} = 4.30\% }[/math]
[math]\displaystyle{ \% error^{2}_{first order} = 5.32\% }[/math]
Along with these first order values, we also ran through the experiment using only the second order maxima, obtaining different values for Planck's constant:
