Superposition
Definitions: Superposition
Exam question
State the principle of superposition.
9702/21 · May/Jun 2025 · Q4(a)
Model answer
When two or more waves overlap at a point, the resultant displacement is the algebraic sum of their individual displacements.
Exam question
State what is meant by coherent.
9702/21 · May/Jun 2023 · Q5(b)(i)
Model answer
The waves have a constant phase difference.
Exam question
State what is meant by diffraction of a wave.
9702/21 · Oct/Nov 2025 · Q4(a)
Model answer
A wave spreads out when it passes through a gap or aperture.
Exam question
State what is meant by a node.
9702/21 · Oct/Nov 2020 · Q6(b)(i)
Model answer
A point on a stationary wave with zero amplitude.