User:Jared A. Booth/Notebook/Physics 307L/2009/09/21: Difference between revisions

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Temperature from Table: 24.55°C<br>
Temperature from Table: 24.55°C<br>
<h5>Droplet 1</h5>
<h5>Droplet 1</h5>
Rise time in seconds: 8.59
Rise time in seconds: 8.59<br>
Fall time in seconds: 12.57, 10.33, 10.75
Fall time in seconds: 12.57, 10.33, 10.75


Revision as of 20:02, 4 October 2009

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Milikan Oil Drop

Raw Data

Width of plastic spacer: Using a calibrated micrometer, d=5.60mm with uncertainty +/- 0.01mm Voltage applied to apparatus: 499.0V DC Thermistor Resistance: 2.070 kohm Temperature from Table: 24.55°C

Droplet 1

Rise time in seconds: 8.59
Fall time in seconds: 12.57, 10.33, 10.75

Droplet 2

Rise time in seconds: 16.83, 18.62
Fall time in seconds: 13.83, 12.34, 14.46, 14.8
The droplet spontaneously reversed charge after a few measurments.

Droplet 3

Rise time in seconds: 5.74, 2.79, 2.58, 2.72
Fall time in seconds: 25.42, 30.24, 29.54

Droplet 4

Rise time in seconds: 5.03, 3.14, 3.00, 3.14, 3.00
Fall time in seconds: 16.69, 13.69, 15.29, 15.36, 14.04

The Droplet spontaneously reversed charge and new measurements were taken.
New rise time: 15.64, 15.5, 15.15, 13.55, 14.81
New fall time: 15.08, 14.46, 13.34, 14.11, 15.64

Droplet 5

Rise time in seconds: 4.47, 4.33, 4.40, 4.33, 4.40
Fall time in seconds: 15.92, 12.58, 14.67, 13.97, 15.55

Droplet 6

Rise time in seconds: 7.75, 7.13, 8.10, 8.31, 8.31
Fall time in seconds: 23.19, 20.19, 24.14, 21.17

The droplet was exposed to a radioactive source for 5 seconds and new measurements were taken. The charge on the droplet was reversed.
Rise time: 7.96, 8.45, 7.90, 8.80, 7.89
Fall time:
The fall time datum were lost due to an error in transfer from timing device.

The droplet was exposed to the radioactive source again.
Rise time: 2.09, 2.10, 2.16, 2.03, 2.16
Fall time: 19.21, 22.36, 20.89, 19.87, 25.78

Since the fall time is independent of charge, and the addition or subtraction of several electrons will have a negligible effect on the mass, it is likely safe to assume the average fall time of the droplet is the same both before and after ionization. Therefore, it would be appropriate to take the average over all measured fall times for droplet 6.


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