Physics · Light
Why are danger signal lights typically red in colour?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1Red light is much easier to produce artificially.
- 2The colour red is chosen purely because it is aesthetically pleasing.
- 3Red light is inherently more reflective than other colours.
- 4Red light has a longer wavelength and is scattered the least by smoke or fog, making it visible from a distance.✓
Correct answer
Red light has a longer wavelength and is scattered the least by smoke or fog, making it visible from a distance.
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