Acceleration amount determines maximum displacement {amplitude, wave}. Mass displacement has distance oscillation. Zero-rest-mass displacement, as in electromagnetic waves, has field oscillation.
Sound and light have energy flow per second per area {intensity, wave}|, which is power per area.
Wavelength has an inverse {wave number}|.
Light rays travel in straight lines {straight-line motion}, because they follow least-action path.
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Date Modified: 2022.0225