You will be given two data tables in the spreadsheet template.
One is for Mercury, the other is for Hydrogen. Analyze ONE gas ONLY. When you have finished one gas, you are through with data taking. Analyze the gas that is at your table. Do not move anything around. :) (DO NOT touch the gas bulbs!)
See the pictures if you want to get a better look at the apparatus.
:) Niels Bohr1885-1962 :)
## MOVIESPlease note: If the movie is too small,please watch via youtube using the YOUTUBE button on bottom right of each video. And, some videos have much higher quality. Find the HD version using the gear icon. Spectrometer |

(DO NOT touch the gas bulbs!)

DON'T EAT THE DAISIES!!!!!!

Hi Doug, I am having trouble on the prelab calculating n (index of refraction). I know the question gives you lambda^-2, as well as theta. For the equation though, aren't we suppose to be using n=(sin((theta+phi)/2))/(sin(phi/2)). I used this equation and put my answer in as to the 100ths place, however I got the question wrong and I even redid my calculation a couple more times and still ended up with the same answer. I am wondering if I am just doing it wrong or what. Thanks! | Anonymous Sun. 10, Apr 2011, 21:46 |

You have the correct equation. Nice job. But...your calculator was in radian mode. So, you will need to convert from degree to radian. n = sin( (theta+phi) / 2 * pi / 180) / sin(phi / 2 * pi / 180) This is good practice before lab this week because MSExcel uses radians. Oh, since phi = 60 degrees, then sin(phi / 2) = sin(30) = 1/2; therefore n = 2 * sin( (theta+phi) / 2 * pi / 180) Oh ^{2}, and notice I used less ()'s. :) | Douglas Mon. 11, Apr 2011, 07:10 |

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