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GCSE Biology · key term
The relationship in which light intensity from a point source is proportional to the reciprocal of the square of its distance from the source.
Used by AQA, Edexcel and OCR
Specification 4.4.1.2 · Paper 1
Revise: Limiting Factors, Inverse Square Law & Greenhouse Economics (HT)The inverse square law describes the change in light intensity. It does not guarantee that the photosynthesis rate changes by the same proportion. If light is limiting, reducing intensity is likely to reduce the rate.
Specification 6.6 · Paper 2
A relationship in which a quantity is proportional to the reciprocal of the square of the distance: .
Apply the inverse square law to light intensity, not automatically to the rate of photosynthesis. The rate changes in the same way only while light is the limiting factor.
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Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
A relationship in which light intensity is inversely proportional to the square of the distance from a point light source.
Revise: Inverse Square LawThe area over which it spreads increases with the square of the distance, so the intensity decreases according to the inverse square law.