Question

Red light is used as signal for stop as it is visible from greater distances than other colours because of its:
1. high frequency and small wavelength compared to any other colour on visible spectrum
2. longest wavelength and high frequency compared to any other colour on visible spectrum
3. longest wavelength and low frequency compared to any other colour on visible spectrum
4. smallest wavelength and low frequency compared to any other colour on visible spectrum

Answer 1

Correct Answer - Option 3 : longest wavelength and low frequency compared to any other colour on visible spectrum

Explanation:

Red means “STOP”, green means “Go”, and yellow means “hurry up and make that damn light”.

Red symbolizes dander in many cultures, which make sense, considering it has the longest wavelength and low frequency of any colour on the visible spectrum, meaning you can see it from a greater distance than other colours.

Green role in lights has actually changed dramatically over time. Its wavelength is shorter than yellow on the visible spectrum, meaning it is still easier to see than any colour other than red and yellow.