Physics A-Level
Inverse-square relationship
What Inverse-square relationship means in Physics A-Level, as defined for AQA.
Definition of Inverse-square relationship
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Reference: AQA
For a point source radiating uniformly in all directions, the same power spreads over a sphere of area 4πr², giving I = P/(4πr²).
Topics that use Inverse-square relationship
- Sensitivity and frequency response (A-level only) (AQA A-Level)
Related terms
- Equal loudness curve
- Intensity
- Logarithmic scale
- Loudness perception
- Relative intensity
- Decibel scale
- Perceived loudness
- Phon
Using Inverse-square relationship in the exam
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