Question

what is the relationship between a light waves properties and what we observe?
the color of the light wave determines its direction.
the energy of the light wave determines its medium.
the amplitude of the light wave determines its brightness.
the frequency of the light wave determines its speed.

Explanation:

• Light wave color is determined by frequency, not direction.
• Light wave energy depends on frequency, not its medium; the medium affects speed, not energy.
• The amplitude of a light wave corresponds to the intensity/brightness we observe.
• Light speed is determined by the medium, not its frequency (frequency determines color).

Answer:

C. The amplitude of the light wave determines its brightness.