9702 · 8.1
Stationary waves
Ever wondered why some musical instruments produce specific notes? It's often due to **stationary waves**, also known as standing waves. Unlike **progressive waves** that transfer energy, stationary waves appear fixed in space, creating predictable patterns of vibration. They are a direct result of **superposition**. This pilot aligns with **Senpai Corner** AS notes (2025–2027) for topic **8.1**.
Need to know
What you need to know
- Stationary waves are formed by the principle of superposition.
- Superposition states that when two or more waves meet at a point, the resultant displacement is the vector sum of the individual displacements.
- A stationary wave is produced by the superposition of two progressive waves of the same frequency, wavelength, and amplitude, travelling in opposite directions.
- This is commonly achieved when a wave reflects from a boundary and interferes with the incident wave.
- Constructive interference (waves in phase) and destructive interference (waves in antiphase) occur at fixed positions.
Explanation
Stationary waves
- Stationary waves are formed by the principle of superposition.
- Superposition states that when two or more waves meet at a point, the resultant displacement is the vector sum of the individual displacements.
- A stationary wave is produced by the superposition of two progressive waves of the same frequency, wavelength, and amplitude, travelling in opposite directions.
- This is commonly achieved when a wave reflects from a boundary and interferes with the incident wave.