# Physics307L:People/Phillips/Photoelectric

(Difference between revisions)
 Revision as of 20:23, 6 December 2008 (view source) (→Data & Results)← Previous diff Revision as of 20:29, 6 December 2008 (view source) (→Data & Results)Next diff → Line 10: Line 10: $h^{1}_{first order} = (6.911 \pm .087) \times 10^{-34}~\mathrm{J}\cdot\mathrm{s} = (4.319 \pm .054) \times 10^{-15}~\mathrm{eV}\cdot\mathrm{s}$ $h^{1}_{first order} = (6.911 \pm .087) \times 10^{-34}~\mathrm{J}\cdot\mathrm{s} = (4.319 \pm .054) \times 10^{-15}~\mathrm{eV}\cdot\mathrm{s}$ + + $h^{2}_{first order} = (6.978 \pm .059) \times 10^{-34}~\mathrm{J}\cdot\mathrm{s} = (4.361 \pm .037) \times 10^{-15}~\mathrm{eV}\cdot\mathrm{s}$ + + each with percent errors from the accepted value of + + $\% error^{1}_{first order} = 4.30\%$ + + $\% error^{2}_{first order} = 5.32\%$ + + + 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 20:29, 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

$h_{acc} = 6.626\,068\,96(33) \times 10^{-34}~\mathrm{J}\cdot\mathrm{s} = 4.135\,667\,33(10) \times 10^{-15}~\mathrm{eV}\cdot\mathrm{s}$

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:

$h^{1}_{first order} = (6.911 \pm .087) \times 10^{-34}~\mathrm{J}\cdot\mathrm{s} = (4.319 \pm .054) \times 10^{-15}~\mathrm{eV}\cdot\mathrm{s}$

$h^{2}_{first order} = (6.978 \pm .059) \times 10^{-34}~\mathrm{J}\cdot\mathrm{s} = (4.361 \pm .037) \times 10^{-15}~\mathrm{eV}\cdot\mathrm{s}$

each with percent errors from the accepted value of

$\% error^{1}_{first order} = 4.30\%$

$\% error^{2}_{first order} = 5.32\%$

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: