User:David J Weiss/Notebook/notes Photoelect: Difference between revisions
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===Day 2=== | ===Day 2=== | ||
*Worked with Elizabeth Allen | *Worked with Elizabeth Allen | ||
*We came into lab and set up the equipment again and turned on the lamp and let it warm up for 20 min again | *We came into lab and set up the equipment again and turned on the lamp and let it warm up for 20 min again. | ||
*We changed out the battery's on the h/e apparatus and a new voltage of 18.9 V was read on the multimeter. | |||
===Experiment 1=== | ===Experiment 1=== | ||
* | *Started with the experiment by first recording the time it takes to charge and what the charge is, starting with the ultra violet then the violet then the blue then the green and finally yellow. For each color we went through each filter 100%, 80%, 60%, 40%, and 20%. | ||
==Data== | ==Data== | ||
===Experiment 1=== | ===Experiment 1=== | ||
Revision as of 14:01, 5 October 2009
Photoelectric Effect Notes
In this lab we will examine the effects of the photoelectric effect and try to determine Plank's Constant.
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Equipment
- Mercury Vapor Light Source and Light Block(Model OS-9286)
- Voltage Range: 108-132 VAC
- Power: 125 W MAX
- Frequency: 47-63 HZ
- 115 Volts
- Light Aperture (Model AP-9369)
- Coupling Bar (Model AP-9369)
- Digital Voltmeter (Model 37XR-A)and/or (model FLUKE 111)
- 2 Connection Cables (Model 8-24)
- Stopwatch
- Two 9 Volt Batteries
- Duracell-Procell
- h/e Apparatus (Model AP-9369)
- 3 Filters
- Relative Transmission
- Yellow Line
- Green Line
Set Up
- First turn on the lamp and let it warm up for 20 minutes as per instructions on instrument
- Connect the voltmeter to the h/e apparatus and check the battery (15.9V) and then connect the voltmeter to the h/e appratus
- Position the lamp and the h/e apparatus so that the emitted light shines on the opening of the h/e apparatus
- Focus the beam by adjusting the light aperture on the adjusting rods
Safety
The major safety concerns in this lab are:
- Electrical avoid shocks from the Lamp
- Avoid damaging the equipment
- Avoid turning the lamp on and off due to potential damage to the bulb
- Avoid touching the filters due to fingerprints interfering with the filters
- Toxic Chemicals from the mercury lamp
Notes
Day 1
- Worked with Elizabeth Allen.
- We first had the Safety brief with Dr Koch. After that we then turned the lamp on so that it could warm up for 20 minutes. After we then aligned and set up the equipment. We then measured the voltage of the h/e apparatus using the multimeter which was 15.9V. We then adjusted the focus of the light in relation to the h/e apparatus.
Experiment 1: The Photon Theory of Light
- Started with the experiment by first recording the time it takes to charge and what the charge is, starting with the ultra violet then the violet then the blue then the green and finally yellow. For each color we went through each filter 100%, 80%, 60%, 40%, and 20%. For the yellow and green we also had to add another filter corresponding to the color.
Experiment 2: Determination of h
We did not have enough time to complete this part of the experiment due to time running out.
Day 2
- Worked with Elizabeth Allen
- We came into lab and set up the equipment again and turned on the lamp and let it warm up for 20 min again.
- We changed out the battery's on the h/e apparatus and a new voltage of 18.9 V was read on the multimeter.
Experiment 1
- Started with the experiment by first recording the time it takes to charge and what the charge is, starting with the ultra violet then the violet then the blue then the green and finally yellow. For each color we went through each filter 100%, 80%, 60%, 40%, and 20%.
Data
Experiment 1
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