h/e Apparatus and h/e Apparatus Accessory Kit
012-04049J
12
®
Procedure
1.
You can see five colors in two orders of the mercury light spectrum. Adjust the h/e Apparatus
carefully so that only one color from the first order (the brightest order) falls on the opening of
the mask of the photodiode.
2.
For each color in the first order, measure the stopping potential with the DVM and record that
measurement in the table below. Use the yellow and green colored filters on the Reflective
Mask of the h/e Apparatus when you measure the yellow and green spectral lines.
3.
Move to the second order and repeat the process. Record your results in the table below.
Analysis
Determine the wavelength and frequency of each spectral line. Plot a graph of the stopping
potential vs. frequency.
Determine the slope and y-intercept. Interpret the results in terms of the
h/e
ratio and the
W
O
/e
ratio. Calculate
h
and
W
O
.
In your discussion, report your values and discuss your results with an interpretation based on
a quantum model for light.
First Order
Wavelength
Frequency
Stopping Potential
Color
nm
x10
14
Hz
volts
Yellow
Green
Blue
Violet
Ultraviolet
Second Order
Wavelength
Frequency
Stopping Potential
Color
nm
x10
14
Hz
volts
Yellow
Green
Blue
Violet
Ultraviolet
Содержание h/e Apparatus
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