User:Emran M. Qassem/Electron Diffraction: Difference between revisions
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The values obtained for the graphite lattice spacing were: | The values obtained for the graphite lattice spacing were: | ||
The linearity of the graphs for <math>D | The linearity of the graphs for <math>D\,\!</math> vs <math>1/\sqrt{Voltage}\,\!</math> in the lab book proves the De Broglie relation. | ||
<br style="clear:both;"/> | <br style="clear:both;"/> | ||
Revision as of 14:48, 21 December 2010
Overview
In this lab we measured the lattice spacing inside a thin sheet of graphite by using the DeBroglie relation:
[math]\displaystyle{ lamda=\frac{h}{p}\,\! }[/math]
and thus proving it.
Procedure
By changing the voltage, we changed the diameter D, and were able to find a linear relation.
By plotting the diameter D, that we measured from the two rings, vs the inverse of the square root of the voltage for each diameter, we were able to find a slope using the LINEST function (least squares) and then use that result to find the lattice spacing d.
Results
The values obtained for the graphite lattice spacing were:
The linearity of the graphs for [math]\displaystyle{ D\,\! }[/math] vs [math]\displaystyle{ 1/\sqrt{Voltage}\,\! }[/math] in the lab book proves the De Broglie relation.
Error
Conclusion
