Question

When white light moves through a vacuum:

(a) All colors have the same speed
(b) Different colors have different speeds
(c) Violet has more speed than red
(d) Red has more speed than violet

Answer 1

In a vacuum, all colors of white light have the same speed.

Step-by-step explanation:

In a vacuum, all colors of white light have the same speed. Hence the statement (a) All colors have the same speed is correct.

The speed of light in vacuum is a universal constant and does not depend on the color or frequency of the light. Therefore, options (b), (c), and (d) are incorrect.