012-04049J
h/e Apparatus and h/e Apparatus Accessory Kit
15
®
Teacher’s Guide
Part A
In each case, the
time to reach full
voltage increases
dramatically
with decreasing
intensity. (up to
a minute for
20% intensity)
Part B
Analysis
1.
The amount of light does not
significantly affect the
stopping potential. It does
affect the time it takes to
reach this potential. From
this we can determine that
the intensity of the light
affects the number of elec-
trons emitted, but not the
maximum energy of the
electrons.
2.
Different colors of light do
affect the maximum energy
of the photoelectrons. The
relationship appears to be
linear.
3.
This experiment supports a
quantum model of light.
The slight drop in the measured stopping potential is due to the leakage of charge through the
zero-gain amplifier. As the intensity decreases, the equilibrium point between the electrons
arriving and the electrons leaving through the amplifier becomes lower.
Exp 1-h/e Apparatus and Accessory Kit
Содержание h/e Apparatus
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