Within the narrow visible band, how do red light and violet light compare in frequency?
ARed light has the higher frequency and violet the lower frequency
BRed and violet light always share exactly the same frequency
CRed light has the lower frequency and violet the higher frequency
DRed light has no defined frequency, unlike violet light
Answer & Solution
Correct answer: C. Red light has the lower frequency and violet the higher frequency
1. Visible light extends from lower frequency red light to higher frequency violet light.
2. Red therefore sits at the low end of the visible band and violet at the high end.
3. Both colours are ordinary parts of the spectrum with well defined frequencies, so the last option is false.
_Source: OpenStax Physics (CC BY 4.0), Ch 15 "Light", section 15.1 The Electromagnetic Spectrum_
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