The laboratory work N^o 50.

Measuring of the characteristics and determination

of parameters of a photo-cell.

Had done by the student gr.__220171я__ F.N.S. Pavlov F.E.

Checked by ______________________ date ____________

Purpose: study the the phenomenon of external photoeffect and to calculate the sensitivity of the photo-cell.

The order of performing a work:

For ouere experiment we use a following scheme:

Where:

P3 – luxmeter;

P2 – microampermeter;

P1 – voltmeter;

3 – photo-cell;

2 – photoresistor;

1 – light source;

R – potentiometer.

Write the results of measurements to the Table1.

Table1.

E, lux	E1=0	E2=400	E3=600	E4=800	E5=1000
U, V	I, 10-3 A	I, 10-3 A	I, 10-3 A	I, 10-3 A	I, 10-3 A
0
20
40
60
50
60
80
100
120
140
160
180
190

- sensitivity of photo-cell

K=0.02875 A/V

Conclusion: study the the phenomenon of external photoeffect and to calculate the sensitivity of the photo-cell.