A harmless little riddle - Take 2

Yes.

Now my riddle to you:

Would someone with a relative velocity (relative to c) of 0 be able to see that light?

See: relativistic doppler effect.

Nothing can travel at the speed of light in vacuum.

Some things can travel faster than light through matter. You would see the light, and there would be a bright flash, the light analogy to a sonic boom.

If a car is traveling at the speed of light and its headlights turn on would they work?[/quote]

The lights would work, but the trick in the riddle is that it is physically impossible for anything (i.e. human, car, human in car, etc) other than elecromagnetic radiation to travel the speed of light. Therefore, the giver scenario cannot exist. And if the scenario doesn't exist, then the headlights cannot work because they don't exist.

Yes. Light always travels at c (speed of light in a vacuum)no matter what the relative speed of the observer is.

regradsf wrote:

Nothing can travel at the speed of light in vacuum.

Some things can travel faster than light through matter. You would see the light, and there would be a bright flash, the light analogy to a sonic boom.

You failed more than once.

The lights would turn on, but as nothing can travel faster than the speed of light, the incremental energy is represented as a shift in frequency toward higher frequencies/shorter wavelengths (ultraviolet). The shift at the emitter is toward red, and at the receiver the shift is toward blue. Ultimately, the shift is such that the wavelength is outside the range of human eyesight.