Physics307L F07:People/Trujillo/LAB NOTEBOOK/071010
data for planck's constant
SETTLE VOLTAGE FOR YELLOW ORANGE:=652mV
4.92s @ 20%
SETTLE VOLTAGE FOR GREEN:=800mV
2.50s @ 60%
SETTLE VOLTAGE FOR BLUE;=1.37V
1.20s @ 100%
2.00s @ 80%
2.80s @ 40%
7.40s @ 20%
Settle voltage for purple=1.50V
settle for UV=1.80V
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..
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 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 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.