Prof. Williams 4.20.2020
The Millikan Oil-Drop
Purpose: The purpose of this experiment was to demonstrate the Millikan Oil-Drop experiment which was done 1909 by Robert Millikan. The purpose of this lab was determining the charge of Eq an electron by suspending charged oil droplets between two electrodes. In order to determine the charge, the voltage was set at the point so that the forces on drop let would be equal. Due to the gravity, there is downward gravitational force on the droplet, and due to the voltage, there is upward electric force. mg
III. DATA
d=0.05 m k=4.086*10-17 (kg s2/m2) m=kv2 V=Ed > E=V/d Eq=mg > q=mg/E
For the particle #1 > V=31.4 V,E=31.4/0.05=628 V/m m=4.086*10-17*6282=6.102*10-17 kg 16T-0T*88ZS'6=8Z9/T8'6*L1-0T*Z0T'9=b Particle Voltage Terminal velocity (m/s) # (V) 1 31.4 1.222
Electric Field (V/m)
mass (kg) 6.102E- 17 1.570E- 16 7.703E- 17 8.112E- 17 7.613E- 17 6.705E- 17 6.303E- 17 8.914E- 17 5.903E- 17 6.303E- 17 7.109E- 17
Charge (C) 9.528E- 19 1.539E- 18 6.407E- 19 6.410E- 19 1.123E- 18 1.282E- 18 1.602E- 19 9.616E- 19 4.804E- 19 4.806E- 19 4.044E- 19
628
1.96
1000
2
50
1179
3
58.95
1.373
62.05
1.409
1241
5
33.25
1.365
665
6
25.65
1.281
513
192.9
1.242
3858
45.45
1.477
606
&
9
60.25
1.202
1205
10
64.3
1.242
1286
11
86.2
1.319
1724
8.204E- 17 8.112E- 17 5.508E- 17 4.608E- 17 9.011E- 17 7.502E- 17 4.908E- 17 5.208E- 17 4.402E- 17 7.206E- 17 5.404E- 17 5.806E- 17 6.508E- 17 5.709E- 17 4.488E- 17 6.202E- 17 8.508E- 17 8.009E- 17 4.908E- 17 4.944E- 17 6.072E- 17 4.748E- 17 8.146E 17
1.437E- 18 6.205E- 19 1.268E- 18 8.369E- 19 1.220E- 18 1.357E- 18 9.986E- 19 2.997E- 19 1.439E- 18 1.218E- 18 6.624E- 19 3.163E- 19 1.330E- 18 7.177E- 19 2.292E- 19 7.797E- 19 1.760E- 19 7.700E- 19 6.504E- 19 2.525E- 19 9.924E- 19 5.543E- 19 8.322E- 19
12
28
1.417
560
13
64.1
1.409
1282
14
21.3
1.161
426
15
27
1.062
540
16
36.2
1.485
724
17
1.355
27.1
542
18
24.1
1.096
482
85.2
19
1.129
1704
20
15
1.038
300
21
29
1.328
580
22
40
1.15
800
23
90
1.192
1800
24
24
1.262
480
25
39
1.182
780
26
96
1.048
1920
27
39
1.232
780
28
237
1.443
4740
29
51
1.4
1020
30
37
1.096
740
31
96
1.1
1920
32
30
1.219
600
33
42
1.078
840
34
48
1.412
960
6.384E- 17 6.559E- 17 7.546E- 17 8.520E- 17 5.089E- 17 1.146E- 16 6.810E- 17 6.487E- 17 5.144E- 17 4.944E- 17 4.385E- 17 4.201E- 17 1.581E 16 5.747E- 17 6.642E- 17 6.778E- 17 7.217E- 17 4.766E- 17 6.425E- 17 8.938E- 17 6.354E- 17 1.483E- 16 6.405E- 17
2.820E- 19 4.467E- 19 4.744E- 19 4.973E- 19 3.961E- 19 5.511E- 19 3.478E- 19 2.505E- 19 2.548E- 19 5.050E- 19 3.162E- 19 3.433E- 19 5.273E- 19 3.757E- 19 2.467E- 19 5.831E- 19 6.553E- 19 3.488E- 19 7.501E- 19 7.304E- 19 9.441E- 19 1.010E- 18 2.829E- 19
35
111
1.25
2220
36
72