Question

Einstein contradicted classical Galilean relativity when he proposed that the speed of light in a vacuuma) Is the same for all observers in any inertial frame of referenceb) Depends on the relative motion of the observerc) Can be determined by adding the velocity vectors of light and the motion of the observerd) Slows down as an observer moves away from the light source

Answer 1

The theory of Relativity rests on the assumption that the speed of light is the same for any observer in any inertial frame of reference. Experimental evidence for this claim was found in the XX century, one example is the famous experiment by Michelson and Morley.

Therefore. the correct choice is: Option A) Is the same for all observers in any inertial frame of reference.