Multiple choice

A red light is used in a traffic signal because

  1. it is visible to people even with bad eyesight

  2. it is beautiful

  3. it has the longest wavelength and can be easily noticed from a long distance

  4. none of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Red color, due to its longer wavelength does not get scattered by the particles in the atmosphere and hence it is used as traffic light. 

Keep practicing — related questions