Physics A-Level
Amplitude
What Amplitude means in Physics A-Level, as defined for OCR.
Definitions of Amplitude
Exam boards and our study guides word this term in slightly different ways. Learn the version your board uses.
Check what you remember
Read the wording for your board, then hide it and explain Amplitude in your own words. Rough notes are fine. This is a self-check, with no mark or grade.
Reference: OCR
Obtained by halving the peak-to-peak voltage, which must be distinguished from peak-to-peak voltage when interpreting an oscilloscope trace.
The quantity A in x = A cos(ωt) or x = A sin(ωt), being the maximum value of displacement x.
The maximum displacement of a particle from its equilibrium position, measured in metres.
The maximum magnitude of displacement from the equilibrium position.
The maximum displacement from the rest position on either graph.
The maximum magnitude of displacement, always positive.
Topics that use Amplitude
- Practical skills (OCR A-Level)
- Simple harmonic oscillations (OCR A-Level)
- Wave motion (OCR A-Level)
Related terms
- Displacement
- Frequency
- Period
- Phase difference
- Accuracy and precision
- Analogue measurement
- Angular frequency
- Apparatus selection
Using Amplitude 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