Final answer:
Two rays of light with the same color will have the same wavelength, but if one is brighter than the other, they have different amplitudes, with the brighter one having a greater amplitude.
Step-by-step explanation:
When comparing two rays of light with the same color but different brightness, we are essentially examining their amplitudes. The color of light refers to its wavelength — with all colors having their specific wavelengths within the visible light spectrum. Same color means same wavelength. However, the brightness of light is proportional to the square of its amplitude. Therefore, if one light ray is brighter than the other, but they both have the same color, their amplitudes are different. The ray with higher brightness has a greater amplitude.