Light intensity and distance
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- Light intensity decrease with distance and affects the rate of photosynthesis. This is because the plant is further away from the light source.
- When a light source is further away from a plant, the light energy is spread over a wider area because light spreads.
- So light intensity is inversely proportional to square of the distance because it is spread over an area.
- This is called inverse square law.
- E.g.
- A plant is 10 cm away from a light source. Light intensity would be inversely proportional to the square of that. 10^2=100.
- Light intensity of the source ∝ 1/100
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- GCSE Biology (Topic 6: Plant Structures and their Functions) Slide Set on Light intensity and distance, created by blah blah on 13/07/2018.
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