Physics A-Level
Irradiance
What Irradiance means in Physics A-Level, as defined for AQA.
Definition of Irradiance
Check what you remember
Read the wording for your board, then hide it and explain Irradiance in your own words. Rough notes are fine. This is a self-check, with no mark or grade.
Reference: AQA
The quantity received from an object that apparent magnitude is a logarithmic measure of, and which depends on both luminosity and distance.
Topics that use Irradiance
- Classification by luminosity (A-level only) (AQA A-Level)
Related terms
- Apparent magnitude
- Apparent versus absolute magnitude
- Brightness
- Intensity of radiation received
- Logarithmic brightness ratio
- Logarithmic brightness scale
- Logarithmic scale
- Luminosity
Using Irradiance in the exam
Check the command word and mark scheme for your exact question. After comparing your explanation with the reference, use the term in an answer on the linked topic. This practice does not predict an exam mark.
Practise Physics questions
Create a free account to answer exam-style questions on this topic and get feedback on your answers.
Start free
All Physics A-Level termsA week of Premium from your first lesson · Then the free plan continues · No card, no charge