Physics A-Level
Event horizon
What Event horizon means in Physics A-Level, as defined for OCR.
Definition of Event horizon
Check what you remember
Read the wording for your board, then hide it and explain Event horizon in your own words. Rough notes are fine. This is a self-check, with no mark or grade.
Reference: OCR
The boundary inside which nothing can escape, including light.
Topics that use Event horizon
- Stars (OCR A-Level)
Related terms
- Black hole
- Chandrasekhar limit
- Electron degeneracy pressure
- Gravitational collapse
- HR diagram
- Main sequence
- Neutron star
- Planet
Using Event horizon 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.
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