According to the station clocks, two babies are born at the same instant, one in Howrah and other in Delhi,
According to the station clocks, two babies are born at the same instant, one in Howrah and other in Delhi, (a) Who is elder in the frame of 2301 Up Rajdhani Express going from Howrah to Delhi ? (b) Who is elder in the frame of 2302 Dn Rajdhani Express going from Delhi to Howrah.
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The birth timings recorded by the station clocks is proper time interval because it is the ground frame.
That of the train is improper as it records the time at two different places. The proper time interval ΔT is less than improper.
i.e. ΔT' = v ΔT
Hence for – (a) up train → Delhi baby is elder (b) down train → Howrah baby is elder.
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