®
Model No. AP-8209
Photoelectric Effect Apparatus
18
4.
Increase the voltage by a small amount (for example, 1 V). Record the new voltage and
current in Table 5.
5.
Continue to increase the voltage by the same small increment. Record the new voltage
and current each time in Table 5. Stop when you reach the end of the VOLTAGE range.
546 nm Wavelength
1.
Cover the window of the Mercury Light Source enclosure.
2.
On the Photodiode enclosure, replace the 436 nm filter with the 546 nm filter.
3.
Uncover the window of the Mercury Light Source enclosure. A spectral line of 546 nm
will shine on the cathode in the Photodiode enclosure.
4.
Adjust the –2—+30 V VOLTAGE ADJUST know so that the current display is zero.
Record the voltage and current in Table 5.
5.
Increase the voltage by a small amount (e.g., 1 V) and record the new voltage and current
in Table 5. Continue to increase the voltage by the same small increment and record the
new voltage and current each time in Table 5. Stop when you reach the end of the
VOLTAGE range
577 nm Wavelength
1.
Cover the window of the Mercury Light Source enclosure.
2.
On the Photodiode enclosure, replace the 546 nm filter with the 577 nm filter.
3.
Uncover the window of the Mercury Light Source enclosure. A spectral line of 577 nm
will shine on the cathode in the Photodiode enclosure.
4.
Adjust the –2—+30 V VOLTAGE ADJUST know so that the current display is zero.
Record the voltage and current in Table 5.
5.
Increase the voltage by a small amount (e.g., 1 V) and record the new voltage and current
in Table 54. Continue to increase the voltage by the same small increment and record the
new voltage and current each time in Table 5. Stop when you reach the end of the
VOLTAGE range.
6.
Turn off the POWER on the apparatus.Turn off the MERCURY LAMP power switch and
the POWER switch on the power supply. Return the apertures, filters, and caps to the
OPTICAL FILTERS box.