Photoelectric Effect Apparatus Model No. AP-8209
25
®
Table 9: Current and Voltage, Constant Frequency, Different Apertures
Experiment 3: Measuring Current-Voltage Characteristics of Spectral Lines -
Constant Aperture, Different Frequencies
The illustration shows typical data for current
versus voltage for a three spectral lines
(435.8 nm, 546.1 nm, 577.0 nm) with the 4
mm diameter aperture.
The next table shows typical data for current
versus voltage for a constant aperture and
three different frequencies.
Table 10: Current and Voltage, Different Frequencies, Constant Aperture
Questions: Experiment 1 - Planck’s Constant
1. How does your calculated value of h compare to the accepted value?
The calculated value of h for the 4 mm diameter aperture is within 1.8% of the accepted value of h.
Student answers will vary.
2. What do you think may account for the difference – if any – between your calculated
value of h and the accepted value?
λ = 435.8 nm
2 mm dia.
V (V) -1.1 0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10
I (x 10
-11
A)
0.0 2.2 4.4 5.9 7.2 8.3 9.4
10.4 11.2 11.9 12.6 13.3
λ = 435.8 nm
4 mm dia.
V (V) -1.1 0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10
I (x 10
-11
A)
0.0 6.8
14.7 19.9 24.5 28.2 32.1 35.2 38.2 41.2 43.5 46.4
λ = 435.8 nm
8 mm dia.
V (V) -1.1 0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10
I (x 10
-11
A)
0.0
27.2 59.7 79.9 97.7
111.6 123.8 133.7 144.5 154.4 162.9 170.4
λ = 435.8 nm
4 mm dia.
V (V) -1.10.01.02.03.04.05.06.07.08.09.010
I (x 10
-11
A)
0.0 6.8
14.7 19.9 24.5 28.2 32.1 35.2 38.2 41.2 43.5 46.4
λ = 546.1 nm
4 mm dia.
V (V) -0.50.01.02.03.04.05.06.07.08.09.010
I (x 10
-11
A)
0.01.33.14.55.36.16.67.27.88.28.79.2
λ = 577.0 nm
4 mm dia.
V (V) -0.30.01.02.03.04.05.06.07.08.09.010
I (x 10
-11
A)
0.00.52.02.83.33.84.34.75.05.35.65.9
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