The colour of visible light is determined by its
Aspeed.
Bintensity.
Cfrequency.CORRECT
Damplitude.
JUPEBPhysicsWaves and Optics
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Why the answer is C, and why the others tempt you.
Colour depends on frequency (equivalently, wavelength in a given medium); red light has the lowest frequency and violet the highest. Amplitude and intensity determine brightness, and all colours travel at the same speed in a vacuum.
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