A standing wave is still moving at normal speed while appearing stationary

Evidence

Thus the sound wave will appear to be stationary between the reflecting boundaries, and so is called a standing wave, or, more precisely, a resonant mode. It is important to realize that the wave is still moving at its normal speed-it is merely that, like a toy train, the wave endlessly retraces the same positions between the boundaries with respect to the wavelength, as shown in Figure 1. — David Howard, Jamie Angus, coustics and Psychoacoustics, 383

Thus the sound wave will appear to be stationary between the reflecting boundaries and so is called a standing wave or, more precisely, a resonant mode. It is important to realize that the wave is still moving at its normal speed-it is merely that, like a toy train, the wave endlessly retraces the same positions between the boundaries with respect to the wavelength, as shown in Figure 1. — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 388

Thus the sound wave will appear to be stationary between the reflecting boundaries, and so is called a standing wave, or, more precisely, a resonant mode. It is important to realize that the wave is still moving at its normal speed—it is merely that, like a toy train, the wave endlessly retraces the same positions between the boundaries with respect to the wavelength, as shown in Figure 1.32. — David Howard, Jamie Angus, coustics and Psychoacoustics, 383

Categorization

• DEFINE: Defines standing wave as a resonant mode while correcting the intuition that it is genuinely stationary — the wave moves at normal speed but retraces identical paths.
• corroborated: 4 independent passages support this claim — David Howard, Jamie Angus, coustics and Psychoacoustics, 383; David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 388
• XREF: connects to: Standing waves arise from counter-propagating reflections with no net energy flow; Opposing waves cancel only momentarily because energy persists in kinetic form; Pressure nodes and antinodes structure inside standing waves have complementary velocity counterparts