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Our results show that 4.399v of light are lost in 102cm of water. In 204 cm of water, 5.36v of light are lost. This is in comparison to our control. One of the things our project illustrated was the need for a control. Because our construction was not perfect, some light was either lost or gained. Since this was true for both our control and experiment, this was no longer a major factor. We could get an answer to our problem. We believe that our conclusion is correct. Light is lost as it travels through water. We have come to a second conclusion. Light is lost at the highest rate early on. Our information suggests this. I am not sure that is correct but I believe so. 4.399v were lost in the first 102cm, but only 0.961v were lost in the next 102 cm.
The reason we are not sure this is correct is because of our construction. A lot of light was lost passing through the two tubes. Barely any light was lost in the first tube. Yet going into the second tube, 87.2% were lost. This is because the glass was not as well done on the second tube. Therefore, a lot of light was lost. Still, we would not be surprised if most of the light was lost in the first few meters of water.
We will speak about what we would have changed now because it addresses the problem of construction. The reason we say this is we had to pile silicon and hot glue on the pipes for everything to hold together. Some of the silicone and glue obstructed the glass and might have adversely affected our results. We think the best way to build the pipes would have been to put a layer of silicon around the end and, after drilling holes in the plastic, screw or nail the plastic to the pipe. The pipes were slightly brittle but I think this would have worked better than our simple silicone construction, which proved quite problematic. The silicon would have only had to keep the seal watertight while the nails or screws would have held the plastic to the pipe.
Another good addition would be trying saltwater. We really have no idea how salt water would affect the light. It might not have any effect (since salt in the ocean is completely diluted in the water). It is still present and would probably cause some disturbance. I am assuming that it would lower the intensity of the light. We were originally planing on using water from the ocean, but this caused a few problems. The water around our shores not only contains the usual debris in seawater, but because of the surf and sandy beaches, the water is murky with sand.
Since light is essential to vision, the amount of light present can tell you a lot about the visibility. Visibility is important to divers. Divers are incouraged to report visibility at dive sites.. It could be dangerous to dive not knowing how well you will be able to see. Navigation would surely become tedious.
Our hypotheses were a little off. Light was lost at a higher rate than we had predicted in the second tube of the control. Yet, the light was much more intense, in the first tube of the control, than we had expected. Our overall results corresponded with our hypothesis. Light was lost at a high rate, as the distance it had to travel underwater increased..

Results:

Distance 

 Control (volts)

 Water (volts)

 102 cm

 4.7

 0.39

 204 cm

 1.011

 0.05

 Percentage of light lost

 78.5%

 87.2%


Hypothesis:

Distance 

 Control (volts)

 Water (volts)

 102 cm

 0.2

 0.1

 204 cm

 0.199

 0.09

 Percentage of light lost

 0.005%

 10%


Graphs

 Background Information

 Analytic Essay

 Diagram

 Link

 Enhancements

 Back to Title Page

 Lab report

 Results

 Photographs

 Animation

 Bibliography

 To St. Matthew's Deep Page

http://www.imagif.net/Back/Water/index.html