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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.
mm
-6.00
1,300.0
6.000
1950.0
-6.000
6,000.0
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
-1.103
2.7
-0.984
6.7
-0.575
5.0
+0.058
2.3
+0.814
-1.058
1.7
-0.941
3.5
-0.539
+0.100
1.1
+0.873
4.0
-1.000
-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
+0.200
0.2
+0.969
-0.870
-0.793
0.390
+1.019
-0.737
0.25
+1.069
0.0
+6.000
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.
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