Use the data in Table III of Millikan's paper to determine the stopping potential as a function of wavelength at 433.9, 404.7, 365.0, 312.5, 253.5 nm.
(R.A. Millikan, Physical Review, 1916, 7, 355)
|
4339 4047 3650 3125 2535
|
|
Volts
|
Def'n.,
mm.
|
Volts
|
Def'n.,
mm.
|
Volts
|
Def'n.,
mm.
|
Volts
|
Def'n.,
mm.
|
Volts
|
Def'n.,
mm
|
|
-6.00
|
1,300.0
|
6.000
|
1950.0
|
-6.000
|
6,000.0
|
-6.000
|
6,000.0
|
-6.000
|
3,500.0
|
|
-1.200
|
10.0
|
-1.087
|
21.5
|
-0.680
|
19.0
|
-0.077
|
16.0
|
+0.736
|
18.0
|
|
-1.153
|
5.7
|
-1.027
|
10.5
|
-0.628
|
9.5
|
0.000
|
6.3
|
+0.777
|
10.5
|
|
-1.103
|
2.7
|
-0.984
|
6.7
|
-0.575
|
5.0
|
+0.058
|
2.3
|
+0.814
|
6.7
|
|
-1.058
|
1.7
|
-0.941
|
3.5
|
-0.539
|
2.7
|
+0.100
|
1.1
|
+0.873
|
4.0
|
|
-1.000
|
1.1
|
-0.900
|
2.5
|
0.495
|
1.5
|
+0.151
|
0.5
|
+3.928
|
2.0
|
|
-0.950
|
0.6
|
-0.845
|
1.0
|
0.437
|
0.6
|
+0.200
|
0.2
|
+0.969
|
1.0
|
|
-0.870
|
0.5
|
-0.793
|
0.5
|
0.390
|
0.2
|
|
|
+1.019
|
0.5
|
|
|
-0.737
|
0.25
|
|
|
|
|
+1.069
|
0.0
|
|
|
|
|
|
|
|
|
+6.000
|
0.0
|
Table III
2. Enter this data into the Excel spreadsheet, and perform a least-squares analysis of the data to determine Plank's constant and its uncertainty. Compare your results to those of Millikan, and discus any differences.