Physics A-Level
Orbital radius
What Orbital radius means in Physics A-Level, as defined for AQA.
Definition of Orbital radius
Check what you remember
Read the wording for your board, then hide it and explain Orbital radius in your own words. Rough notes are fine. This is a self-check, with no mark or grade.
Reference: AQA
Fixed once the period T is chosen, given by r³ = GMT²/(4π²) for a satellite in a circular orbit around a planet of mass M.
Topics that use Orbital radius
- Orbits of planets and satellites (A-level only) (AQA A-Level)
Related terms
- Escape velocity
- Geostationary orbit
- Gravitational force as centripetal force
- Gravitational potential energy
- Kinetic, potential and total energy in circular orbits
- Low orbit
- Synchronous orbit
- Altitude
Using Orbital radius 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