Lux Investigation

Improved Essays
The graph would require to form a straight line in relation to the distance and LUX reading, to verify the inverse square law. The straight line would occur as the intensity of the light would gradually decrease, the further away it is analysed from the source. Conversely, if the distance squared was graphed alongside the light intensity, an ‘x’ would be created, as the distance squared increases the further away it gets.

- Does the graph support your hypothesis? Why or why not? (2 marks)
The graph formulated after experimenting with both 12 and 6 volts, strongly validates our hypothesis. We hypothesised that, as the distance from the light box increased, it would impact the intensity of the light, causing the intensity to decrease due
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What does your graph mean? (2 marks)
After completing the practical, it was found that the data obtained verifies the inverse square law. The inverse square law states, that the intensity of the luminosity is inversely proportional to the square of the distance from the source. On the first attempt at measuring the LUX of a 12-volt light, the intensity decreased the further away the source was from the light. Although the intensity of the yellow light decreased, the distance squared sum conversely went up. The LUX reading at 10cm away from the light was 162.3 however at 100cm away, the LUX reading was 17.6.
The above graph, formulated from the data obtained during the experiment, displays the relationship between the distance and the intensity of the light. It could be seen in the graph that, when the distance from the source is elevated, the amount of light is distributed a larger area. The light loses intensity, becoming less apparent having been spread over a greater distance; in theory creating a straight line. However, the graph above doesn’t create a straight line, displaying that human and unforced errors occurred whilst conducting this
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We would make sure to conduct the practical in a pitch black or darker room, then what we initially attempted it in. A darker room would result in less excess light interfering with the intensity of the light we were measuring, ensuring more accurate data to record.
I would also make sure to manage our time more wisely or have people doing different tasks within the practical, to guarantee completion of the practical. By doing so, enables us to collect all the data required to graph the results, ensuring we see the pattern properly.
CONCLUSION: (2 marks)
Write a short conclusion based on your aim.
To conclude, the inverse square law affects the relationship between the light intensity and distance at which it is from the source. Prior to completing this practical, we hypothesized that the intensity of the light will decrease as the distance from the light box increases. Upon completion of the practical our hypothesis was proven correct and verified the inverse square law; when measuring the intensity of the light the LUX reading was greater 10cm away from the light box, in comparison to the last

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