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# Light Intensity and Distance

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## Becky S

on 4 December 2012

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#### Transcript of Light Intensity and Distance

By: Becky Simonson
Group: Kaylie Hodge, Whitney Finn Light Intensity and Distance Tables and Graphs Research Question What is the relationship between light intensity and its distance? Hypothesis Due to the change in distance, the farther away the light receptor is the from the light source the lesser amount of light received. Therefore causing light intensity to decrease the further distance away it is from initial starting point. Method First, we attached the light source to one end of the optics bench and then positioned source so light was coming out of only the hole . (0 cm) Distance Light
(cm) Intensity (lux)
10 800
15 262
20 140
25 86
30 58
35 44
40 28.5
45 27
50 20
55 17
60 15
65 13
70 10 Graph is exponentially inverse Will light intensity decrease the farther away it from light source? Next, we placed light receptor 10 cm away from light source and continued moving it and additional 5cm after each recording. (note: if light was too dim and was reading 262 on the graph, we changed light receptor so it would receive a stronger intensity of light).

We continued moving it until it was 70 cm away from the light source. The light receptor was stationed within a holder where it was to receive light intensity coming from the initial light source All information was recorded and graphed in Data Studio Materials Base optics bench that measures in cm
Computer
10 watt base optic light source Data Studio Holders for light receptor Analysis While working on this experiment we had no problems really occurred. At first, we noticed a dramatic decrease in light intensity when the receptor was at 15cm, 20cm, 25 cm (decreasing by about half every 5cm). We noticed when the light receptor was about 45cm away from the light source the sensor reading kept showing up as 262. Therefore, we switched the light receptor from light bulb intensity to a sunlight intensity. From 50-70cm away the light intensity varied slightly. Light receptor that has candle light, light bulb, and sunlight intensities Conclusion In conclusion, our hypothesis was proven correct. By the end of the experiment we were able to conclude that the farther away the light receptor was from the light source, a decrease in light intensity was recorded. Evaluation
1/(distance)^2 Variables Independent: Distance from light source Dependent: Light intensity detected Overall, the experiment went well and our hypothesis was correct. For even more accurate results we could have done multiple tests instead of just one. Do it in a room with no other light sources. (Example: other students light sources, other rooms lights and computer lights) Apparatus
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