The Data
Student Built Light Meters
Brad Katuna, Physics Teacher, Sir Francis Drake HS

                                               

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Distance
Voltage
(cm)
(volts)
.1
7.8
10
4.2
20
2.1
30
1.3
40
.80
50
.55
60
.40

As you can see from observation of the above graph, the relationship appears to be an inverse one between distance and volage. Remember, the digital multimeter is calibrated to the experiment, so that voltage is proportional to brightness.

 

 

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Date last modified: 7/15/99