User:Thomas S. Mahony/Notebook/Physics 307L/2009/10/12: Difference between revisions

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==Data==
==Data==


'''Experiment 2'''': to collect our data, we positioned the h/e apparatus in front of five different colors of the spectrum produced by the mercury source, yellow, green, blue, violet, and ultraviolet.  For the yellow and green lines, we used corresponding yellow and green filters during data collection.  The procedure includes, lining up the color on the aperture of the h/e apparatus, then holding the zero button on the side of the apparatus in order to ensure the potential was produced purely by the mercury light source.  Then once the potential settles on the voltmeter we recorded it and moved to the next color. We repeated this procedure a total of 5 times for each color and then repeated for a 2nd order of the spectrum.
'''Experiment 2''': to collect our data, we positioned the h/e apparatus in front of five different colors of the spectrum produced by the mercury source, yellow, green, blue, violet, and ultraviolet.  For the yellow and green lines, we used corresponding yellow and green filters during data collection.  The procedure includes, lining up the color on the aperture of the h/e apparatus, then holding the zero button on the side of the apparatus in order to ensure the potential was produced purely by the mercury light source.  Then once the potential settles on the voltmeter we recorded it and moved to the next color. We repeated this procedure a total of 5 times for each color and then repeated for a 2nd order of the spectrum.


===Experiment 1===
===Experiment 1===

Revision as of 12:47, 25 October 2009

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Lab Summary

Equipment

  • Pasco Scientific Hg Light Source OS-9286
  • Pasco Scientific h/e Apparatus AP-9368
  • Fluke 111 Multimeter w/ banana cables

Setup

We followed the instructions in Professor Gold's Manual. Setup is fairly straight forward for this experiment, we plugged in the mercury light source and let it heat up for around 20 minutes before taking measurements, in order to insure that the lamp was at maximum intensity. Next we plugged the voltmeter into the h/e apparatus to test the two 9 volt batteries. The batteries must be at a minimum level of 6 volts for the experiment to run properly (see page 3 of the Pasco Manual). Lastly before taking measurements, we focused the beam of light on the white reflective mask by moving the lens back and forth on the support rods until the image was as sharp as possible.

Data

Experiment 2: to collect our data, we positioned the h/e apparatus in front of five different colors of the spectrum produced by the mercury source, yellow, green, blue, violet, and ultraviolet. For the yellow and green lines, we used corresponding yellow and green filters during data collection. The procedure includes, lining up the color on the aperture of the h/e apparatus, then holding the zero button on the side of the apparatus in order to ensure the potential was produced purely by the mercury light source. Then once the potential settles on the voltmeter we recorded it and moved to the next color. We repeated this procedure a total of 5 times for each color and then repeated for a 2nd order of the spectrum.

Experiment 1

{{#widget:Google Spreadsheet

key=0AkKX7q2M_dXGdFM1QWoxeGtpZ1hFeEhZdkk2Q2w5aFE width=1020 height=500

}}

Experiment 2

{{#widget:Google Spreadsheet

key=0AkKX7q2M_dXGdFo3bzhhNUFOMERaeHpRdzU0QW8zMlE width=1020 height=500

}} Note: The second order green line took a while to charge.

Also in between measuring the first and second order lines, we readjusted the focus.

Analysis

Since the second order green line took a while to reach its stopping voltage, and that value was a much higher voltage than the first order voltage, we think some very faint higher frequency light may have also been hitting the detector.


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