B.2.6—Mean solar intensity Topic Practice
B.2.6—Mean solar intensity Topic Practice

IB Physics syllabusPhysics SL/HLFirst assessment 2025
Practise converting the solar constant into mean global intensity and using albedo and emissivity to calculate absorbed energy or surface temperature.
How this is tested
- explain the S/4 factor by comparing Earth's intercepting disc area with its total surface area
- calculate mean absorbed intensity with (1 - albedo)S/4 before using it in equilibrium temperature work
- apply the mean-intensity model to bodies like the Moon, substituting albedo and σ to find surface temperature
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