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Stationary waves (General (You can demonstrate stationary waves by setting…
Stationary waves
General
- You can demonstrate stationary waves by setting up a periodic driving oscillator at one end of the string with the other end fixed to a position.
- the wave generated by the oscillator is reflected back and forth. If the oscillator generates waves of a fixed frequency and amplitude then reflected waves and waves that have not been reflected will reinforce one another.
No materials are moved by stationary waves, much like transverse waves. However, unlike transverse waves, they can't move energy either.
Stationary wave - the superposition of two progressive waves with the same frequency and amplitude, moving in opposite directions.
- The frequencies at which this occurs are called resonant frequencies. It causes a stationary wave where the pattern doesn't move along at all hence no energy being transferred.
Even more general
- This means that, at a node, there is total destructive interference.
- This also means that, at an antinode, there is constructive interference.
- A stationary wave is just the superposition of two progressive waves, under certain circumstances. It is just two waves interfering.
At resonant frequencies, an exact number of half wavelengths fit into a string. e.g. 1/2, 1, 1 and 1/2, 2, etc.
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