# Uncertainty of Grating Constant

1. Oct 30, 2005

### jdog6

All right, I have to calculate the uncertainty of the grating constant (k=1/d).

I know that the standard deviation of my 14 values of d(spacing bewtween 2 slits in a diffraction grating) is ± 5.031x10-16 m.

Average d = 3.403x10-6m .
k= 2.939x105lines/m.
How would I find uncertainty? 1/± 5.031x10-16 m?

If this is an introductory course then$$\Delta$$K = K*($$\Delta R/R$$) would suffice as the uncertainty in your value of K.