Which color has a higher frequency?

• A. Red
• B. Blue
• C. Green
• D. Yellow

Answer: (B)

Light frequency is tied to wavelength: shorter wavelengths mean higher frequencies. In the visible range, red light has the longest wavelength, so it has the lowest frequency, while blue light has a shorter wavelength than red, yellow, and green, giving it a higher frequency than those colors. So, among the options, blue sits higher on the frequency scale. Red would be lower, and yellow and green have longer wavelengths than blue, so their frequencies are lower as well.