## Experiment 2

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FIRST ORDER:

 Color Wavelength (nm) Frequency (Hz x10^14) Stopping potential (V) Yellow 576 5.2 .67 Green 545 5.5 .79 Blue 441 6.9 1.35 Violet 411 7.3 1.55 Ultraviolet 366 8.2 1.84

SECOND ORDER:

 Color Wavelength (nm) Frequency (Hz x10^14) Stopping potential(V) Yellow 576 5.2 .7 Green 545 5.5 .82. Blue 441 6.9 1.37 Violet 411 7.3 1.56 Ultraviolet 366 8.2 1.86

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The key to this graph is seeing that the equation

for the slope of this line is very similar to

Where we need to multiply the entire equation by the charge of an electron to make sure we have an energy unit obtained on the left (in this case electron volts)

Because  , and m is the ratio

First, we multiply m by e, and remember that my Hz values include an extra .

by first multiplying the slope by the electron, we obtain  for planks constant. But then, with the in the denominator of the slope, we get

The Work function can simply be found as the y-intercept of the graph. Meaning, electrons are being knocked off the metal, but not getting any kinetic energy. It is therefore 1.356 eV

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