Photoelectric Effect Apparatus
Model No. AP-8209
11
®
Slope = __________________
h
= e x slope = _______________________
4.
Estimate the error in the slope and round your result to the appropriate value. Compare
your calculated value of
h
to the accepted value,
h
0
, 6.626 x 10
-34
J s.
5.
Record your percent difference ______________________
Questions
1.
How does your calculated value of
h
compare to the accepted value?
2.
What do you think may account for the difference – if any – between your calculated
value of
h
and the accepted value?
3.
How can you find the value of the Work Function from the graph of Stopping Potential
versus Frequency?
Extension
Repeat the data measurement and analysis procedure for the other two apertures in the OPTICAL
FILTERS box
Table 2:
.
Stopping Potential of Spectral Lines, 2 mm diameter Aperture
Table 3:
.
Stopping Potential of Spectral Lines, 8 mm diameter Aperture
Item
1
2
3
4
5
Wavelength,
λ
(nm)
365.0
404.7
435.8
546.1
577.0
Frequency,
ν
, (x 10
14
Hz)
8.214
7.408
6.879
5.490
5.196
Stopping Potential,
V
(V)
Item
1
2
3
4
5
Wavelength,
λ
(nm)
365.0
404.7
435.8
546.1
577.0
Frequency,
ν
, (x 10
14
Hz)
8.214
7.408
6.879
5.490
5.196
Stopping Potential,
V
(V)
percent difference =
h h
0
–
h
0
---------------
x100