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Though not to 13 digits of precision (!), you are going to measure the Rydberg constant by plotting $\Large{\frac{1}{\lambda_n}}$ vs. $\Large{\frac{1}{2^{2}}-\frac{1}{n^{2}}}$ . | Though not to 13 digits of precision (!), you are going to measure the Rydberg constant by plotting $\Large{\frac{1}{\lambda_n}}$ vs. $\Large{\frac{1}{2^{2}}-\frac{1}{n^{2}}}$ . | ||

- | The Lab 8 pretest asks you to calculate the value of $d$ because you need it for the analysis of your data. You obtain the value of $d$ from knowing that the number of grooves per inch for the diffraction grating is 13,400. Calculate the spacing in meters between the grating grooves to get your value of $d$ . Be careful with units! Not only do you have to convert from inches to meters, but you also must notice that the units of grooves per inch is one over length, in //SI units//, m$^{-1}$. | + | The Lab 9 pretest asks you to calculate the value of $d$ because you need it for the analysis of your data. You obtain the value of $d$ from knowing that the number of grooves per inch for the diffraction grating is 13,400. Calculate the spacing in meters between the grating grooves to get your value of $d$ . Be careful with units! Not only do you have to convert from inches to meters, but you also must notice that the units of grooves per inch is one over length, in //SI units//, m$^{-1}$. |

Move the diffraction grating to ~ 60 cm from the discharge tube. This is the distance $y$ in the earlier figure that defines the geometry of your setup. Record $y$ accurately along with an estimate of its uncertainty. | Move the diffraction grating to ~ 60 cm from the discharge tube. This is the distance $y$ in the earlier figure that defines the geometry of your setup. Record $y$ accurately along with an estimate of its uncertainty. |