This question is about simultaneity. The diagram below shows a railway carriage

Question

This question is about simultaneity. The diagram below shows a railway carriage travelling to the right at constant velocity. A flashbulb is hanging from a point midway between the ends L and R of the carriage. Each flash produces single pulses sent in opposite directions. Clare is at rest at the centre of the carriage. Light pulses from the flashbulb are observed by Clare to strike the opposite walls L and R of the carriage simultaneously. Nino is at rest on the ground. He is opposite Clare at the moment when the bulb flashes. State and explain whether Nino observes the pulses striking L and R simultaneously.

Explanation / Answer

No,Nino would not observe pulses to strike walls L,R Simultaneously.
This is when the carriage is travelling at a speed close/relative to speed of light ~ 3*108m/sec.

This can be solved by Velocity Addition Formula of Special Theory of Relativity.

As Clare is at rest w.r.t Carriage,but According to Nino,Carriage is moving at relative speed , so Nino finds Light pulse travelling to L reach Faster while light pulse travelling Towards R reach slower.

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