PASCO h/e Apparatus, Инструкция по эксплуатации

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012-04049J h/e Apparatus and h/e Apparatus Accessory Kit
9
®
Light Color
Yellow
Green
Blue
Violet
Ultraviolet
Stopping Potential
Part B
1.
You can easily see five colors in the mercury light spectrum. Adjust the h/e Apparatus so that
only one of the yellow colored bands falls upon the opening of the mask of the photodiode.
Place the yellow colored filter over the White Reflective Mask on the h/e Apparatus.
2.
Record the DVM voltage reading (stopping potential) in the table below.
3.
Repeat the process for each color in the spectrum. Be sure to use the green filter when measur-
ing the green spectrum.
Analysis
1.
Describe the effect that passing different amounts of the same colored light through the Vari-
able Transmission Filter has on the stopping potential and thus the maximum energy of the
photoelectrons, as well as the charging time after pressing the discharge button.
2.
Describe the effect that different colors of light had on the stopping potential and thus the
maximum energy of the photoelectrons.
3.
Defend whether this experiment supports a wave or a quantum model of light based on your
lab results.
Explain why there is a slight drop in the measured stopping potential as the light intensity is
decreased.
➤ ➤ ➤ ➤ ➤
NOTE: While the impedance of the zero gain amplifier is very high
( ♠ 10
13
Ω )
, it is not
infinite and some charge leaks off. Thus charging the apparatus is analogous to filling a
bath tub with different water flow rates while the drain is partly open.