Which sequence shows all the spectral colors of visible light arranged in an increasing order of their frequency?

a. red, yellow, orange, blue, green, indigo, and violet
b. red, orange, yellow, green, blue, indigo, and violet
c. violet, indigo, blue, green, yellow, orange, and red
d. violet, indigo, green, blue, orange, yellow, and red

b.red, orange, yellow, green, blue, indigo, and violet

Explanation:

Frequency and wavelength are inversely proportional to each other. Electromagnetic waves that have a long wavelength will have a low frequency and vice versa. Wavelength and frequency are related by the following equation:

ν = c / λ

where ν, c and λ is the frequency, speed and wavelength of light respectively.

Red light has a long wavelength thus it has a low frequency.  And violet light has a short wavelength thus it has a high frequency.

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