- #1

henry wang

- 30

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**Mod note**: Moved from a technical forum section, so missing the homework template.

I am analysing the data from my undergrad experiment, which the aim is to find the Plank's constant by scattering x-ray off NaCl crystal and using Braggs law.

The straight-line equation is as follows: [tex]eV=h\frac{c}{2dsin(\theta)}[/tex]. I am only considering the uncertainty in theta since it is the dominant uncertainty in my experiment.

To find the uncertainty in the Planks constant, h, I rearranged the above equation to [tex]h=\frac{2eVdsin(\theta)}{c}[/tex] and used the error propagation equation and found [tex]\Delta h=\frac{2eVdcos(\theta)\Delta \theta}{c}[/tex]. I have 16 data points of different x-ray energies, so I found dh of all 16 data points and took its average. Is this a good approach?

PS: Should I move this thread to the Homework and Coursework section?

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