Q20

Jo is in the centre of a train carriage travelling close to the speed of light to the right. Lamps F and B, located at the front and back of the train respectively, are switched on simultaneously as Jo passes an observer Bo, who is on the platform equidistant from the lamps when the light is emitted.

According to Bo, which of the following statements is correct in terms of the perceived arrival times of the flashes of light?
A. The lights turn on simultaneously for Jo.
B. The lights turn on simultaneously for Bo.
C. The light at the back turns on before the light at the front for Jo.
D. The light at the front turns on before the light at the back for Bo.