Discussion
Which of the following colours has highest frequency in visible spectrum range ?
Answer: A
The colour with the highest frequency among those listed is blue.
For light, frequency and wavelength are inversely related: \(f = c/\lambda\), where c is the speed of light. The shorter the wavelength, the higher the frequency. In the visible spectrum blue light has a wavelength of roughly 450 to 495 nm, shorter than green (about 495 to 570 nm), yellow (about 570 to 590 nm) and red (about 620 to 750 nm).
So blue has the highest frequency of the four, and red, with the longest wavelength, has the lowest. Violet, at the very short end of the spectrum, would be higher still, but it is not among the options; green and yellow lie between blue and red.
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