Chemistry / Chem 0763 · Atom · ~20 seconds
Amplitude
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A wave's amplitude is the magnitude of its displacement from the resting position, read as half the height between peak and trough.
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A brighter beam of light has a larger amplitude than a dimmer beam of the identical wavelength and frequency.
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Amplitude sets a wave's intensity or brightness — it does not by itself change that wave's wavelength or frequency.