Brightness refers to the intensity, or amplitude, of a light wave. The corresponding term when discussing sound is

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The term that corresponds to brightness in sound is loudness. Both brightness and loudness refer to the intensity or amplitude of a wave, whether it be light or sound. Hue refers to the color of light, while timbre refers to the character or quality of a sound. Pitch refers to the perception of the frequency of a sound wave.

Brightness Refers to the Intensity, or Amplitude, of a Light