Final answer:
The light with the highest frequency among the options is violet. It has the shortest wavelength, which means it has the highest frequency in the visible spectrum compared to green, red, and blue.
Step-by-step explanation:
The highest frequency light among the options provided is violet. In the visible spectrum, violet light has the shortest wavelength and consequently the highest frequency. Therefore, the correct answer is d. violet. As frequency and wavelength are inversely related, light with a shorter wavelength will have a higher frequency. So, if we compare light with varying colors such as green, red, and blue, we find that green light has a frequency lower than that of blue, and red light has a lower frequency than both green and blue.
The sequence comparing wavelength and frequency would be (from highest to lowest frequency): violet > blue > green > yellow > red. Violet light, being on the one end of the spectrum with the shortest wavelength, will have the highest frequency.