Question

Question 8
Which of the following statements is correct regarding the propagation of light of different colours of white light in air?

(a) Red light moves fastest
(b) Blue light moves faster than green light
(c) All the colours of the white light move with the same speed
(d) Yellow light moves with the mean speed as that of the red and the violet light

Answer 1

Option (c) is correct
The speed of light in air/vacuum is constant and does not depend on characteristics of the wave (e.g. its frequency, polarization, etc). In other words, in air/vacuum the light of different colours of white light travel at the same speed.