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E ∝ A^2

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Power
Energy and Thermal Physics PRACTICAL PHYISCS

Investigating light intensity from a lamp

Demonstration: Measuring how the light intensity of a lamp varies with power input.

Practical Activity 14-16

Electromagnetic Radiation
Quantum and Nuclear Supporting Physics Teaching

Light spreading out

As light spreads out from a source, its intensity decreases due to the processes of absorption and spreading.

Teaching Guidance 14-16

Power
Light, Sound and Waves IOP TAP

Episode 315: The inverse square law

This episode considers the ways in which the intensity of radiation decreases with distance from the source.

Lesson 16-19

IOP DOMAINS Physics CPD programme

Waves CPD videos

Our new set of videos gives teachers and coaches of physics a preview of the training we offer ahead of this term's live support sessions.

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