1. The problem statement, all variables and given/known data Which electromagnetic waves travel the fastest in a vacuum? a. Violet light. b. Red light. c. Ultraviolet light. d. Red, violet, and ultraviolet light travel at the same speed. ok so i thought that in a vacuum every wave traveled at the same velocity, so only the frequency could vary. I know the ultraviolet light has the highest frequency, so i was assuming d was the correct answer. But im not so sure because d doesnt really specify they travel the same only in a vacuum but it says the travel at the same speed in general so i dont know whether it is c or d.