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Visible-light wavelength comparison
Visible light is the only group of electromagnetic waves that the human eye can detect.
Which colour of visible light has the shortest wavelength?
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- 1 Answers violet; purple is also accepted.
Full-mark answer
Violet.
Why this answer loses marks
Red.
This reverses the visible-spectrum order: red is at the long-wavelength end, not the short-wavelength end.