Which color is associated with a frequency around 600 THz in the described mapping?

Which color is associated with a frequency around 600 THz in the described mapping?

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

Answer: (C)

The key idea is that visible color is determined by the light’s frequency (or wavelength). Using the relationship f = c/λ, a frequency of about 600 THz corresponds to a wavelength of roughly 500 nanometers. That wavelength sits in the green region of the spectrum, so the color associated with 600 THz is green. Red has longer wavelengths (around 700 nm), blue has shorter wavelengths (around 450 nm), and yellow sits near the green–yellow border, but 500 nm aligns best with green.

The key idea is that visible color is determined by the light’s frequency (or wavelength). Using the relationship f = c/λ, a frequency of about 600 THz corresponds to a wavelength of roughly 500 nanometers. That wavelength sits in the green region of the spectrum, so the color associated with 600 THz is green. Red has longer wavelengths (around 700 nm), blue has shorter wavelengths (around 450 nm), and yellow sits near the green–yellow border, but 500 nm aligns best with green.