Consider a train moving at a speed of 0.6 relative to the ground. A light in one of its windows blinks repeatedly. An observer on the ground will necessarily see (not observe) those blinks to be separated by a larger time interval than a person on the train would.

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Quizplus · Accepted Answer

The speed of light is constant for all observers, regardless of their relative motion, according to the theory of relativity. Therefore, the time interval between the light blinks, as seen (not observed, which might imply relativistic effects like time dilation) directly, would not be affected by the train's motion relative to the observer.

Consider a Train Moving at a Speed of 0