Physics307L F08:People/Trujillo/LAB NOTEBOOK/071010

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FIRSTWEEK

Contents

data for planck's constant

SETTLE VOLTAGE FOR YELLOW ORANGE:=652mV

stop=612mv

1.28s @100%

1.20s @80%

1.72s @60%

2.04s @40%

4.92s @ 20%

SETTLE VOLTAGE FOR GREEN:=800mV

STOP=712mV

1.40s @100%

2.10s @80%

2.50s @ 60%

4.90s @40%

12.0s @20%


SETTLE VOLTAGE FOR BLUE;=1.37V

STOP=1.23V

1.20s @ 100%

2.00s @ 80%

2.00s @60%

2.80s @ 40%

7.40s @ 20%

Settle voltage for purple=1.50V

stop=1.34V

1.28s @100%

1.40s @80%

1.56s @60%

1.92s @40%

5.76s @20%

settle for UV=1.80V

stop=1.62V

6.2s @100%

6.4s @80%

9.7+/-2.0s @60%

17.4s @40%

81s @20%

Data Drocessing

Image:Plancks.jpg


Tomas and I were able to do some first and second order curve fitting on this graph but was not able to get a percise Planks estimation. Our first order looked like 11e-34J. Does not see right..

Methodology

Following instructions in Dr. Gold's lab manual, I made sure the equipment was set up correctly to perform the experiment. First, one should get the light from the lamp as focused as possible by adjusting the diffraction grating/lens. Next, one should make sure light from the lamp reaches the photocathode of the \tfrac{h}{e} apparatus. How to do this is described in the manual. (perhaps I should upload the manual in case www-hep.unm.edu goes down again) following that, one should test the batteries of the \tfrac{h}{e} apparatus. I suppose the minimum ratings for the batteries are listed were the apparatus's test points are, so they are +6V and -6V. Measure using a multimeter from the apparatus's ground to each of the battery test points. I measured +8.70V and -8.69V, so the batteries were fine.

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