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Millikans Oil Drop Lab

Extracts from this document...

Introduction

Charge (C)

Charge (C)

Charge (C)

Charge (C)

9.90 E-19

6.67 E -19

1.67 E -19

1.48 E -18

9.85 E -19

6.66 E -19

1.66 E -19

1.32 E -18

9.85 E -19

6.61 E -19

1.65 E -18

1.31 E -18

9.75 E -19

6.61 E -19

1.65 E -18

1.17 E -18

9.68 E -19

6.60 E -19

1.62 E -18

1.16 E -18

8.27 E -19

6.55 E -19

1.61 E -18

1.15 E -18

8.20 E -19

6.54 E -19

1.50 E -18

1.15 E -18

8.13 E -19

4.91 E -19

1.49 E -18

1.147 E -18

6.69 E -19

3.35 E -19

1.49 E -18

1.14 E -18

6.68 E -19

3.28 E -19

1.48 E -18

1.14 E -18

7/17/2009

Millikan’s Oil Drop Experiment

Observations:

Table 1: Data recorded for the Charge of each of the 40 drops

Based on the above results it can

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Middle

Table 2: Charges Recorded to Two Significant Figures

Difference in Charge (C1-C2)

Charge (C)

1

9.90E-19

2

5.00E-21

9.85E-19

3

1.00E-20

9.75E-19

4

7.00E-21

9.68E-19

5

1.41E-19

8.27E-19

6

1.40E-20

8.13E-19

7

1.53E-19

6.60E-19

8

5.00E-21

6.55E-19

9

1.64E-19

4.91E-19

10

1.56E 19

3.35E-19

11

7.00E-21

3.28E-19

12

1.61E-19

1.67E-19

13

-1.443E-18

1.61E-18

14

1.10E-19

1.50E-18

15

1.00E-20

1.49E-18

16

1.70E-19

1.32E-18

17

1.50E-19

1.17E-18


A graph can be plotted representing the data of the charges:

Graph 1: Charges for Each Drop

image00.png

Based on the above step graph it can be seen that there are many values close in magnitude. Differences in charges very close to each other can be said to have “small step values”. Based on the data from Table 2, it can be said that the smallest step value is either the difference between drops 2 and 3, or 10 and 11. These are 1.

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Conclusion

image09.pngimage09.png), r is the plate separation, and Vb is the voltage.

image02.png

image03.pngimage03.png C

Therefore the mass of the droplet is: image04.pngimage04.png Kg, and the charge on the drop is: image05.pngimage05.png C.

Conclusion:

Overall the experiment went well and proper values were recorded. Since no two drops can have the same data, a variety of answers could be correct each within a certain small percent error of each other. Another reason for discrepancy could be due to the fact that different values of P (density of oil) could have been used. However for the most part, the above values have been calculated correctly. To improve such an experiment, one could ensure that everyone uses the same value for P, and as a result more accurate answers can be calculated.


[1] http://hypertextbook.com/facts/2000/IngaDorfman.shtml

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